您现在的位置是:文人墨客網 > 廣東省
長篇累牘黑楊冪 被判賠5萬後:我是大學生求放過
文人墨客網2024-06-17 08:23:50【廣東省】4人已围观
简介長篇累牘後大學生求放過Sincetakingcharge,hisresearchcenterhaspublishedaseriesofacademicpapersinmajorscientificjournals,includingNature,whichhashelpedraiseShanghaiUniversity'sinternationalprofile
長篇累牘後大學生求放過Since taking charge, his research center has published a series of academic papers in major scientific journals, including Nature, which has helped raise Shanghai University's international profile
黑楊冪被She received Bachelor of Science at Stanford University and Doctor of Medicine from the University of Utah, according to faculty information of Pittsburgh University判賠5萬She has received a number of awards for her work, including the Meyenburg Foundation Award for Cancer Research and the Robert Koch Prize
長篇累牘後大學生求放過Chang was born in Taiwan and moved to the United States as a young child黑楊冪被com]Clarivate Analytics, formerly the Intellectual Property and Science business of Thomson Reuters, announced its 2017 Citation Laureates - scientists whose publications have been cited so often by their colleagues that they could be recipients of a Nobel Prize this year or in the future判賠5萬The couple was listed for the discovery of the Kaposi's sarcoma-associated herpes virus (KSHV), also known as human herpesvirus 8 (HHV8)長篇累牘後大學生求放過Chinese-American Yuan Chang, 58, joined the list of physiology or medicine laureates, together with her husband Patrick S黑楊冪被Kaposi's sarcoma (KS) is the most common cancer in HIV-infected untreated individuals
判賠5萬Tsien (1952-2016) got his Clarivate citation prize of chemistry in 2008, before he co-won the Nobel honor in chemistry at the same year, with Osamu Shimomura and Martin Chalfie, for the discovery and development of the green fluorescent protein (GFP)長篇累牘後大學生求放過Professor Chang is a Co-Director of the Tumor Virology Laboratory at the University of Pittsburgh Cancer Institute黑楊冪被"In addition, I have found that sugar imports are increasing
判賠5萬Until the 18th century, when the technology for extracting sugar from cane was developed, and 19th century, when we learned how to get it from beets, sugar was only available when the fruit ripened or the bees got busy長篇累牘後大學生求放過About 12 percent of children aged 7 to 18 in the survey were overweight黑楊冪被Judy Zhu / China DailyA 24-foot-tall pyramid of boxes marked "sugar" in the middle of Times Square makes a point that's kind of hard to ignore判賠5萬The world does consume too much "added sugar" - a term the USDA began using in 2000 to help people spot processed foods that have added energy with no added nutrition
"Every country that has adopted the Western diet, one dominated by low-cost, highly processed food, has witnessed rising rates of obesity and related diseases," the journal Nature commented recentlyHigh fructose corn syrup, raw, brown and white sugar, honey, maple syrup, molasses make up about 16 percent of the calories Americans consume and have zero nutritional value
As the researchers in Nature put it: "In recent years, sugar has been added to virtually every processed food, limiting consumer choice5 million children in the US are obese, the CDC says, blaming snacks and foods high in sugar and saltFor children aged four to eight, the AHA suggests no more than three teaspoons of sugar a day, about 130 calories of a 1,600-calorie diet1 million pounds of added sugar a day - enough to fill 273 yellow school buses
A can of soda has the equivalent of seven to 12 teaspoons of sugar"A report from a survey of 14 provinces in China found that the daily intake of sugars for Chinese people was lower than the level recommended by the World Health Organization, but for children between the ages of 3 and 17 it was much higher because of the growing popularity of sugary drinks, China Daily reported in MayA display in Times Square includes a sugar tower that is 15 feet wide by 24 feet highIt is made of cartons depicting more than 45,000 pounds of sugar, surrounded by life-size models of "crystallized" children
The top domestic consumers, in descending order, are India, the EU, China, the US and BrazilStanding sentinel around the mound are ghostly sculptures of small children, apparently made out of sugar-like granular material, wearing tags that read: "I am 9 years old and weigh 64 pounds
According to the National Soft Drink Association, the industry produces 600 12-ounce cans of sugary drinks per person per year, most of it what they call the full-sugar variety, and supplies more than a quarter of what Americans drinkThe publicity stunt, created by Magnetic Collaborative agency to promote power bar-maker Kind's new line of fruit snacks, which have no added sugar, is meant to sound an alarm
In descending order, Brazil, India, the EU, Thailand, China and the US are the top producersThe survey, conducted in 2014 by China's health, education and sports authorities, found that the sugar intake of males 13 to 17 surpassed 8"There are now 30 percent more people who are obese than who are undernourishedThe average child takes in 21 teaspoons a day, the AHA saysThe white paper went to great lengths to define China as one of the "destabilizing factors" along with Democratic People's Republic of KoreaIt highlighted "more tangible" and "acute" challenges and destabilizing factors
The legislation provides greater flexibility, responsiveness, and interoperability for training, exercises, and planning on a broader spectrum of security issues by easing restrictions on Japanese Self-Defense Force operations, including the ability to exercise collective self-defenseThis will empower Japan to be an active player at the region and global stages
The white paper, the first after Japan's security legislation went into effect in March, played up the so-called "gray zone" situations, or neither pure peacetime nor contingencies over territory, sovereignty and economic interestsIn its 2016 defense white paper, Japan interferes in the South China Sea
The white paper served as an implementation scheme for the controversial security bills that enable Japan's Self-Defense Forces to play a more comprehensive global military role and allow implementation of the new US and Japan alliance guidelinesIt made irresponsible accusations against China, claiming that China continues to act in an "assertive" manner, including attempts at changing the status quo by coercion
cn]On August 2, Japanese government approved this year's version of defense white paper, which described the security environment surrounding the country "increasingly severe"China's "dangerous acts" in the South China Sea and East China Sea could cause unintended consequences(To overblow Chinese ship's entry, Japan's foreign ministry summoned Chinese Ambassador to Japan Cheng Yonghua in the tee hours of that day, and lodged a protest)Refusing to have a territorial dispute in the East China Sea, Japan is unlikely to talk with China over its settlement, leaving the waters near the islands a minefield
The Japanese Maritime Self-Defense Force destroyer Hatakaze quickly followed them into that areaIn response to the Hatakaze's entry, the Chinese Jiangkai I-class frigate rushed into the waters, according to the Japanese weekly Nikkei Asian Review
Hiding the first part of the episode, the white paper criticized China for its frigate's entry into Japan's "contiguous" zone near the disputed islets in the East China SeaOn June 8, three Russian naval ships entered the waters close to the Diaoyu Islands
The defense legislation eliminates geographic constraints by substituting a situational threshold (situations that "gravely affect the peace and stability of Japan") rather than limiting support to "situations in areas surrounding Japan"Iowa's ties with China had already shown signs of increasing
Even though Iowa is best known for its agricultural products and services, Reynolds said that advanced manufacturing is "actually the largest sector of our GDPReynolds said last month when announcing the trip that "there is no better time than now to market and pitch our products in China"We believe as a united Iowa agricultural delegation, we can find opportunities that are beneficial to both China and Iowa," Reynolds saidAccording to Allen Williams, the business development manager at the Iowa Economic Development Authority, the state has had more inquiries from China in recent months than in the previous two or three years
Our relationship with the country is strong, and their growing middle class means increasing purchasing power, and Iowa stands to gain significantly as a resultUS beef had been banned from China since 2003 due to a mad cow disease scare
" When Branstad was receiving a Chinese trade delegation as Iowa governor in March, he remarked that he would like to be able to enjoy a bite of US beef at the US embassy in BeijingMeetings are planned for the delegation with Chinese government officials, industry partners and Branstad in Beijing, Shanghai and Xi'an, Shaanxi province
Iowa Governor Kim Reynolds is leading a trade mission to China that will feature officials from groups representing the state's major agricultural producersReynolds, who succeeded Terry Branstad as governor when he became the US ambassador to China on May 22, noted that agricultural "is the backbone of Iowa's economy and contributes about $112 billion to our economy annually"
很赞哦!(22)
上一篇: 周傑倫陪嶽父逛古董市集 大吃美食情同父子戀愛談多了,演技也好了,受打擊也能笑著說沒關係了白百何高調複出後的造型越來越知性選公辦校還是國際校?海南官方確認博鼇銀豐康養醫院違法接種宮頸癌疫苗跌停潮下A股將何去何從長安福特一球成名 縱享優惠陝西省委原常委被雙開:一再拒絕黨組織挽救心態崩了?阿德搶七大戰迷失自我 正負值全場最低是否恢複冥王星“行星”地位?天文學家將進行辯論長沙銅官窯黑石號文物首次進京參展曾國藩的人生智慧都在這七點裏了如何走出抑鬱想自殺的陰霾為孩子辭職在家 丈夫卻另結新歡湖北民眾省道上趟水摸魚美蘭機場蟬聯SKYTRAX五星機場四條遊覽路線帶你逛世園會運動館 | 晚上鍛煉比清晨好,研究發現效率能提高50%符家三個女兒都成了皇後駐愛爾蘭使館:防電信詐騙今年上1億人有電子社保卡搜狐Q1營收4.3億美元 淨虧5700萬美元同比大幅減虧海軍航空兵最強轟6K 攻擊範圍覆蓋美軍基地成都男性投入家務時間超女性誌玲姐姐現身車展 依舊很嫩抖騷型男音樂節撩妹指南專家教你高考怎麽報誌願Letme一打二反殺,操作重回MSI巔峰,RNG夏季賽穩了?英語聽力考滿分,真的全聽懂了嗎?網友:我不是學霸趙麗穎微博取關前經紀人黃斌《隻狼:影逝二度》評測:宮崎美學,再登神壇女副局長與民眾座談發飆:你哪個小區的 記下來如何用英文笑傲社交網絡中俄“海上聯合—2019”軍事演習俄方參演艦艇抵達青島20歲後做什麽,未來10年能夠受益匪淺?華世奎、譚延闓:南北兩位顏楷大家,你更喜歡誰肯豆的腋下包才是輕巧出行的好搭檔租金會以5%到10%速度增長?壓線生易落榜 如何報上好大學?倪妮靠金色連衣裙美出新高度北京三裏屯的這場快閃,怎麽傳來建築工地的聲音?高速出現這4項都是你責任一季度投資消費出口搶眼 外貿確保進出口穩中提質華為董事會首席秘書接受外媒采訪甜蜜暖婚:總裁寵妻很狂野戰勝塑料汙染 建設美麗中國縣人社局副局長被查後 基層醫療機構46人自首退贓紅樓夢為什麽獨寫"薄命司"總決賽-廣東2-0領先新疆快訊 | 國家衛健委:我國兒童青少年總體近視率達53.6%中俄“海上聯合—2019”軍事演習俄方參演艦艇抵達青島馬化騰:拿出10億元支持我國基礎科學研究遊戲義肢設定給玩家勇氣折疊屏手機柔宇柔派終於開賣投拉卡拉獲50倍回報,雷軍再次送出1000g金磚"懶得載你"!好友集資送新車 男子傻站車前淚崩Baby又被懷疑“開眼角”了?90後美女和她的300多件定製“蔬菜塑…三國猛將中,典韋如排第三,許褚第一個不服4招拍出讚爆朋友圈照片
下一篇: 湯神最新緋聞女友比基尼寫真陌陌7.71億美元收購的探探因違規遭下架 探探回應未披露上架時間墨爾本維多利亞美術館下一站傳奇獨播 2018-10-21 期塔克4000雙鞋讓保羅羨慕嫉妒 喬丹被震驚試駕東風日產全新逍客:更加精致倪妮嘟嘴賣萌霸氣舉槍 和張震親密互動崩潰!浙江女子9000元的寵物雞 被人偷宰準備下鍋造車新勢力拜騰“渡劫”白宇跑男太拚戴臉基尼亮相 大張偉曝有焦慮症鬥破蒼穹[會員搶先看]VIP 更新至38集遭迪士尼”打臉”拒絕收購 知名韓廠NEXON股價跌8.3%董明珠正式贏得與雷軍的"十億賭約"給孩子做飯難?“常回家做飯”快成奢侈品北京重型柴油車換新,國六排放標準渣土車上市警方介入海南涉假HPV疫苗案,即將公訴WNBA選秀大會 韓旭第14順位被紐約自由人選中新浪彩通解讀國內外彩票行業內幕倪妮嘟嘴賣萌霸氣舉槍 和張震親密互動航拍韶關茶園 春季茶農采茶忙德帥:我們本該多20次罰球3分鍾帶你漫遊蘇州水鄉古鎮郭台銘再談台防務靠和平:為何要中國人打中國人?北京《網絡空間法治化治理白皮書》首次發布比爾蓋茨:去世後20年將關閉基金會28輛車連環相撞致4死 現場大火燃燒濃煙滾滾杜海濤痛哭心疼沈夢辰死去的寵物狗可以克隆"複活"嗎?恒指收漲近1%報29892點 騰訊控股漲近2%透視|北歐的血統 吉利最強轎跑SUV星越刪節版視頻後又現刪節版錄音,劉強東“性侵案”已成公關大火拚零度角 | 日本想東京幹掉國乒?劉國梁一招盤活全局低保特困人員由政府補助英超-冠軍在望!阿圭羅破門 曼城1-0伯恩利返榜首一對“毒鴛鴦”被查秒變戲精 稱“吸毒為了國家”哪個外賣App更省錢?我辦了會員後 發現這些套路湛江開啟南國鄉村之旅周傑倫陪嶽父逛古董市集 大吃美食情同父子北京發布大風藍警 陣風8級有揚沙王思聰出質大連合興投資股權塞弗洛薩試水自由市場 前防守二陣球員恐難留爵士孫紹騁:退役軍人保障法有望今年提交審議《往日不再》1.05更新修複bug5G將觸發VR/AR產業的爆發與成熟國資改革重磅文件出台,允許國企開展股權激勵國安要逼出個冠軍!恒大曾慘死此招,泰國大連相繼送命二度揚帆出海的昆蟲無雙——《地球防衛軍:鐵雨》評測曝湖人已退出濃眉交易實拍:城管粗暴鏟翻老太菜攤離婚後給老公留下1080億美金三星Galaxy Fold拆解:柔性屏內部啥樣粉絲演唱會上求婚 王力宏焦急圍觀:不要擋到我原來健身房小夥伴可以這麽嗨!這部減肥爆笑神劇追定了朱丹偏頭痛犯了 女兒擔心地摸她額頭國慶北京首賊大興落網 身藏6部手機數張銀行卡汶川地震後十年 救災扶貧創新成效顯著4月樓市成交穩中有落,土地供應同環比走高山東青島全國愛鳥周春光中的火烈鳥AI還原林青霞舊照,高清圖下的顏值照樣能打嗎?中國式相親背後:講戶口、講房產,就是不要講感情
相关文章
- 租房貸:資金供給一旦斷裂 鏈條上各環節無一幸免
- 終於不否認了!樸有天承認吸毒:我害怕自己就此放棄
- 情陷於諾,總裁的兼職太太
- 狐友國民校草張恩豪:上天不負努力的人
- 一對“毒鴛鴦”被查秒變戲精 稱“吸毒為了國家”
- 老艾:內資砸盤幫外資抄底
- 滴滴付強:成立司機服務部 將設兩千名司機服務經理
- 日侵台死傷兩倍於甲午戰爭
- 2019版第五套人民幣發布:5角硬幣改為鎳白色 暫無5元紙幣
- 波音客機又出事!空中起火 發動機不斷噴出火焰
- 大學校園鮮花盛開 爭奇鬥豔
- NBA五佳球:哈登迎射湯普森 霍福德泰山壓頂血帽字母哥
- 陝西省委原秘書長被雙開:拒絕接受黨組織挽救
- 重磅!廣州出台“搶人”新政:本科連續半年社保即可入戶!
- 副部級官員被指嚴重破壞任職地政治生態 曾主政鄂爾多斯包頭
- 女星花7億離婚:憑本事單身多酷
- 搜尋日本墜海F35 美請出當年搜尋馬航MH370“利器”
- 內蒙古體育局亮相2019斯邁夫國際體育消費展覽會
- 湖南4男子深夜砸百餘台豪車 作案18起竊財10多萬
- 蔚來否認轎車項目叫停:規劃開發仍在進行
- 美國男子被自己養的大鳥殺死,他的100隻神奇動物將被...
- 五一臨近電視“騷動”:高端產品成消費拉動力
- 全麵學習資料與你分享
- 全方位空氣淨化器,8分鍾淨化一室陰霾
- “這麽玩PPT,我的外快賺得比工資多”
- 習近平會見奧地利總理
- 汶川地震後十年 救災扶貧創新成效顯著
- 北京世園會國際展園印象
- NBA-火勇大戰爭議判罰 屢次漏判勇士3分犯規成焦點
- 土耳其4層高危樓轟然倒塌 居民大聲尖叫
- MSI明星雲集世界冠軍齊聚一堂
- 2019版第五套人民幣發布:5角硬幣改為鎳白色 暫無5元紙幣
- 未來的銷量擔當 試駕奇瑞全新一代瑞虎8
- 俄羅斯實力派畫家作品展黑龍江亮相
- 央行發行2019年版第五套人民幣 票麵更鮮亮
- 創sports創客談:專訪FIRSTPOINT USA首席執...
- 狐狸廚房 | 熬黏粥隻知道小火慢燉?科學方法是這5點
- 湖南常德一文物保護標誌碑遭人為破壞
- 旗幟鮮明地支持馬斯克:激光雷達三年內將被取代!
- 恩比德:我的確帶傷打球 但我需要更多出場時間
- [征集]春色滿園 美景常在
- MyndVR 2.0將VR帶給老年人
- 英國能夠也應該與華為合作建設5G網絡
- 體驗吉利星越-偶像派還是實力派
- 272名工作人員被累死!印尼大選1.93億選票全靠人工數
- 格力電器擬分紅90億:董明珠總收入上億
- 杜特爾特再嗆加拿大:不運走垃圾 就“埋了”加使館
- MH370最終搜尋報告:花1.6億美元 僅找到3塊殘片
- 伊拉克用中國02式高射機槍打
- 辯論!誰才是動畫中的最強小朋友?
- 漫畫:在1秒內讓女友炸毛
- 麵臨誌願填報需了解什麽?
- 英語聽力考滿分,真的全聽懂了嗎?網友:我不是學霸
- 哈爾濱女車主站車頂維權:我沒學曆 就想討個公道
- 深圳公積違規提取3年內不得再次申請
- 英語聽力考滿分,真的全聽懂了嗎?網友:我不是學霸
- 樂視網一季度收入銳減70% 第一股東賈躍亭99.99%凍結
- 更新至18集創業時代黃軒楊穎還原熱血創業史嘉賓:黃軒 Angelababy 周一圍
- 劉詩詩新劇真的很趕客
- 浙江發布近視防控意見
文人墨客網的名片
职业:Also, Xi has been very good at choosing the right people to work with him程序员,陈德志设计师
现居:陕西咸阳礼泉县
工作室:誰在“出爾”,誰在“反爾” --“中國出爾反爾論”可以休矣小组
Email:“韓劇”反轉?韓法院駁回對李勝利逮捕令
热门文章
- 五一小長假小客車高速免費
- 蘇州樓市再現搶地搶房 這一輪將狂奔多久?
- 一線|OYO與支付寶達成戰略合作 將全麵接入支付寶小程序
- 異性之間,這些增進感情的小技巧,往往對男人很受用,不妨試試看
- 羅永浩宣布小野電子煙上市:前員工開發、錘子設計
- 盧在會談中展示與湖人感情 他曾在總決賽防守艾弗森
- 刀塔自走棋更新英雄戴澤
- 脫歐延期改變英國人度假習慣 非歐盟國家受青睞
- 動作冒險遊戲《控製》高清截圖
- 中國式飯局說話套路集錦
- 最佳陣容:7外援霸占中前場
- 李亞男產後瘦身成功,曬照秀完美身材
- NBA-火勇大戰爭議判罰 屢次漏判勇士3分犯規成焦點
- 促銷導致網站掛了?亞馬遜中國官網、APP、小程序無法打開
- 國慶北京首賊大興落網 身藏6部手機數張銀行卡
- 趙繼偉僅休假一周就開練 希望能夠早日回到巔峰
- 商務部核減直銷產品四成以上 為消費者挽回損失超1億
- 英國廢舊核潛艇處理成難題:已拖累英軍戰力
- 贏球隻是運氣好?世乒賽日本對國乒八戰全敗輸得很徹底
- 梵文版諸佛菩薩種子字
- 牛市加餐重倉150隻個股 券商自營一季度"好這口"
- WNBA選秀大會 韓旭第14順位被紐約自由人選中
- 林允演繹日式複古風情
- 首條無線充電公路邊走邊充好嗨呦
- 報告總裁,你家萌妻要出牆
- 視頻-梅西替補建功 巴薩提前三輪衛冕西甲冠軍
- 副部級官員被指嚴重破壞任職地政治生態,曾主政鄂爾多斯包頭
- 購車太“窘”搖幾年了
- 獨立魚:每集4分鍾的沙雕劇,每一幀都笑出腹肌
- 《隻狼:影逝二度》評測:宮崎美學,再登神壇
- 台網友:做替死鬼還傻笑
- 挪威畫師《指環王》藝術圖
- 我國首個海上發射火箭命名“CZ-11 WEY”,今年發射
- 海關總署:防止柬埔寨非洲豬瘟傳入我國
- 了不起的“中國造”,比Q7還霸氣,續航1000KM,或40萬
- 新浪2019國際學校擇校巡展震撼來襲
- 特朗普高調出征迎戰希拉裏
- 科創板基金銷售大戰打響 今日募集規模已超400億
- 光明日報:中國網文何以成海外讀者新寵
- 賈躍亭崇拜者的執迷:賣過樂視是種驕傲 等他回歸
- 第8期|林傑:提升吉利品牌價值 衝擊全球車企十強
- 異性之間,這些增進感情的小技巧,往往對男人很受用,不妨試試看
- 世園會開園探訪:遊客排隊搶購紀念郵票、“首日封”
- 周天勇:一帶一路建設需避免三種問題
- [路演]青青稞酒:在全國市場重點布局“小黑”產品
- 泰禾、陽光100等房企頻繁賣項目股權 “補血”背後風險猶存
- 新違約時代到來!違約“常態化”下的市場出清與換血
- 新一代加價王?雷克薩斯LM
- 1.5萬在鶴崗能買一套房?
- 美將發射碳觀測衛星 完善氣候變化預測
- 周天勇:如何落實好“一帶一路”規劃
- 7.0媽媽咪鴨小萌鴨烏龍認"媽"笑料百出
- 環境部回應華北多城PM2.5反彈:少數地方出現鬆懈情緒
- 海南9000元假宮頸癌疫苗案開出罰單:沒收醫院違法所得,罰款8000元
- 52本書拉開與同齡人差距
- 申萬宏源吃癟原因為何?
- 遭迪士尼”打臉”拒絕收購 知名韓廠NEXON股價跌8.3%
- 蘇貞昌揚言拿掃把跟大陸拚 國台辦:盲人騎瞎馬
- “誌願文學”網絡作家基層行上海啟動
- 美阿帕奇直升機服役33年仍居榜首 中國武直差在哪
站长推荐
樂清母親策劃兒子失聯虛假警情 一審被判1年3個月
劉濤濕發造型複古摩登感
"玩"是給孩子最好的獎勵之一
怕老婆是隋文帝一生的軟肋
日本向國際乒聯遞交抗議信 伊藤早田輸中國因誤判
章子怡帶醒寶逛遊樂園 理由竟然是這個?
重慶參與“一帶一路”建設沿
天文學家將進行關於是否恢複冥王星“行星”地位辯論
國內首款油電混動MPV 奧德賽銳·混動今上市
德國百年煤礦倒閉後,被改造成熱門旅遊景點,獲評世界文化遺產
時刻守護你的消費權益
曾經兩勝梅西的MVP 如今曼聯高薪的罪魁禍首
抄襲出的經典:荒野大鏢客
百花村收購“踩雷”臨ST,國企或變身民營
寡婦橋傳說:不一樣的寡婦不一樣的橋
海拔4600米世界第一熱泉
廢物利用的藝術太有創意
用一張表,解決和孩子的溝通問題
國產航母完成一重要工程 海軍專家做高度評價
電子社保卡那些事 權威解讀一次說清
“這麽玩PPT,我的外快賺得比工資多”
歐文正名之戰像極了詹姆斯
蔡國慶望朱正廷有陽剛之氣
連媒:一方戰國安徹頭徹尾失利
郭台銘再談台防務靠和平:為何要中國人打中國人?
沈北新區聚力打造優質營商環境
唐雎不辱使命是個大牛皮
湖北民眾省道上趟水摸魚
與韓國瑜缺乏互信?吳敦義怒斥吳韓會非“鴻門宴”
圍觀程序員夫婦婚房 全屋智能家居住起來太爽了