[化] 防护剂; 保护剂; 防老剂; 防老化剂

protective agent的用法和样例：

例句

The action of calicium as a protective agent against inimical ions is not a highly specific function.钙作为一种保护剂以抗御有害离子的作用，并不表现高度的特效性功能。
Most studies focused on the methods of cryopreservation and finding better cryoprotective agent.目前研究焦点在于寻找更好的冷冻保护剂和简化操作方法等方面。

听电影学英语-暮光之城 09

[00:08.04]I should go back there and rip those guys' heads off. 我要回去把他们的头扯掉 [00:09.60]No, you shouldn't. 不，不要 [00:11.00]You don't know the vile, repulsive things they were thinking. 你不会明白他们脑子里的肮脏恶

发表于:2018-11-30 / 阅读(150) / 评论(0)

听电影学英语-暮光之城

CNN 2010-03-24

Well that's a pressure cooker of a day on Capitol Hill as we wait and wonder how this vote for healthcare plays out, the final vote is expected Sunday and Democratic house leaders are trying to convince undeclared members to vote yes. 216 votes are n

发表于:2018-12-02 / 阅读(116) / 评论(0)

CNN2010年(三)月

SSS 2010-12-29

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Beauty is only skin deep. And the beauty of shiny white teeth is even less deep. Because a new study shows that fluoride forms a thinner protective shiel

发表于:2018-12-02 / 阅读(125) / 评论(0)

Scientific American(十二)月

SSS 2009-12-22

In 2008 astronomers discovered surprising amounts of water molecules where planets were forming near young stars. But how, they wondered, could those molecules survive? They should have been destroyed by ultraviolet radiation. In theory, planetary du

发表于:2018-12-02 / 阅读(109) / 评论(0)

Scientific American(十二)月

VOA慢速英语20060124a

AGRICULTURE REPORT - Don't Know Much About Mulch?By George Grow Broadcast: Tuesday, January 24, 2006 I'm Faith Lapidus with the VOA Special English Agriculture Report. Mulch is important to farmers. M

发表于:2018-12-07 / 阅读(77) / 评论(0)

2006年慢速英语（一）月

事实：城墙的保护屏障-Ramparts Are Protective Barriers

Ramparts Are Protective BarriersWhen you sing or listen to the Star Spangled Banner, do you understand the words? The national anthem of the United States of America was inspired by the Battle of Baltimore at Fort McHenry in 1814. The lyrics suggest

发表于:2018-12-19 / 阅读(75) / 评论(0)

Facts-事实

北师大版高中英语模块3--Unit 8 Adventure lessons2-4

[00:07.37]Comparing cultures [00:09.71]Listen to a person talking about sports [00:11.96]in the USA and Britain and answer the questions [00:16.27]American football is one of the most popular [00:18.95]sports in the United States. [00:21.50]It's very

发表于:2018-12-29 / 阅读(151) / 评论(0)

北师大版高中英语模块3

赖世雄进阶英语词汇3500 Unit26

advice n.劝告，忠告，建议（不可数） Can you give me an advice? 你可以给我一个建议吗？ advise vt.劝告，忠告；通知 The doctor advised Grandfather not to climb too many stairs. 医生建议祖父别爬太多楼梯。 Trav

发表于:2018-12-30 / 阅读(81) / 评论(0)

赖世雄进阶英语词汇3500

托福听力短文 I-12-1

(man) I know you're anxious to get your permits and get started. But there're just a few things I'd like to mention that might help you avoid trouble during your stay. First of all, make sure you carry adequate water. You'll need it if you're hiking

发表于:2018-12-30 / 阅读(126) / 评论(0)

托福听力短文

SSS 2009-10-05

The 2009 Nobel Prize in physiology or medicine goes to Harvards Jack Szostak, Johns Hopkinss Carol Greider and Elizabeth Blackburn at U.C. San Francisco for their work on how chromosomes are protected by telomeres and the enzyme telomerase. The Nobel

发表于:2019-01-08 / 阅读(113) / 评论(0)

Scientific American(十)月

北师大版高中英语模块7--Unit 27(4)-2

[00:00.00]Qianlian is keen to go to university [00:03.32]but she definitely [00:04.27]doesn't want to study medicine [00:06.26]She used to simle all the time [00:07.83]but now she looks washed out and unhappy [00:10.51]She's also lost a lot of weight

发表于:2019-01-10 / 阅读(177) / 评论(0)

北师大版高中英语模块9(选修)

VOA慢速英语20060708a

IN THE NEWS - Shuttle Crew Is Busy on the Space Station, as NASA Faces Pressure to Finish the JobBy Jerilyn Watson Broadcast: Fri, 7 Jul 2006 16:00:00 UTC I'm Steve Ember with IN THE NEWS in VOA Speci

发表于:2019-01-30 / 阅读(79) / 评论(0)

2006年慢速英语（七）月

VOA慢速英语20060314a

AGRICULTURE REPORT - More Nations Move to Vaccinate Farm Birds Against Deadly FluBy Mario Ritter Broadcast: Tuesday, March 14, 2006 I'm Steve Ember with the VOA Special English Agriculture Report. Unt

发表于:2019-01-30 / 阅读(70) / 评论(0)

2006年慢速英语（三）月

AGRICULTURE REPORT - Mulch

AGRICULTURE REPORT - September 3, 2002: Mulch By George Grow This is Bill White with the VOA Special English AGRICULTURE REPORT. Mulching is one of the best things people can do for their plants. Mulc

发表于:2019-01-30 / 阅读(115) / 评论(0)

农业与发展

英语绕口令集锦：T

T. Thank the other three brothers of their father's mother's brother's side. The blue bluebird blinks. The cat catchers can't catch caught cats. The crow flew over the river with a lump of raw liver.

发表于:2019-02-01 / 阅读(106) / 评论(0)

趣味英语

英文原版对话1000个:596 Mornings with the Dog

Todd: Michael, what time did you get up this morning? Mike: About 7, no 6. Todd: Really, is that like your normal schedule? Mike: I usually get up around 6. (Yeah) Yeah. Go to bed around 11. Get up at 6. On a good day, sometimes go to bed later. Todd

发表于:2019-02-02 / 阅读(64) / 评论(0)

原版英语对话1000个

Owen joins Stoke as free agent

Owen joins Stoke as free agent LONDON, Sept. 4 (Xinhua) -- Former England striker Michael Owen has signed for Stoke City as a free agent, said the English Premier League side on Tuesday. The 32-year-old sealed a one-year contract with Stoke after bei

发表于:2019-02-05 / 阅读(110) / 评论(0)

英语新闻

Neymar's agent hits out at Pele

RIO DE JANEIRO, Feb. 20 (Xinhua) -- The agent of Brazil starlet Neymar has accused Pele of hypocrisy and jealousy after the football legend's stinging attack on the 21-year-old's attitude. In a controversial newspaper interview published on Wednesday

发表于:2019-02-07 / 阅读(172) / 评论(0)

英语新闻

艾伦脱口秀第13期:觉得蛮搞笑的

The fact you even have them ahead of time. 其实你们早就拿到剧本了 No, I mean, she is pretty protective about,I don't think our spoilers are as sort of big as the Scandal's spoilers. 没有我的意思是她很看重保密我觉得剧透对

发表于:2019-02-15 / 阅读(60) / 评论(0)

艾伦脱口秀

英语悠选脱口秀第46期:别人的老师会做盔甲了

讲解 Todays key word is Armor Armor 盔甲还可以写作Armour. Armor is a protective covering that is used to prevent damage from being inflicted to an object, or individual. Personal armor is used to protect soldiers. Here are some examples: Ne

发表于:2019-02-21 / 阅读(136) / 评论(0)

英语悠选脱口秀

最新学习文章

热门学习文章

热门标签

英语听力 VOA标准英语 VOA 英语歌曲口语听力提高听力材料听力教程英语学习 NPR 英语口语 VOA慢速英语美国国家电台儿童英语 VOA英语小学英语 cnn VOA常速英语标准英语英文歌曲听电影学英语英语单词英文电影慢速英语 CRI 美联社新闻美国有线新闻加州分级澳洲新闻流行歌曲常速英语 ABC新闻快递疯狂英语英语读物听力棚车少年经济学人英语词汇商务英语 VOA双语新闻 BBC 中国电台大学英语 Treasures 加州语文 BBC英语英语听力网站 VOA英语教学词汇万花筒 SSS VOA英语听力 AP 新概念分级英语英语广播听力精选英语播客英文绘本 TED演讲赖世雄英语MP3 CCTV9英语新闻 lesson 英语新闻初中英语学英语英语语法历史上的今天英文广播剧英语游戏原版英语小说英语有声读物书虫英语牛津英语读物访谈录新闻一分钟考研英语英语每日在线听新闻 Us 新概念英语地道英语单词第二册自然百科高中英语 sports 实用英语 MP3听力辛沛沛 ESL英语第一册英语每日一句 unit 新东方 GRE 每日一词 BBC听力

学英语单词

abrupt coast

alexander

allium ledebourianum schult.f.