na. 过氧化氢
[网络] 双氧水

世界上最伟大的演讲--SHALL WE CHOOSE DEATH?我们该选择死亡吗？

SHALL WE CHOOSE DEATH?我们该选择死亡吗？ I am speaking not as a Briton, not as a European, not as a member of a western democracy, but as a human being, a member of the species Man, whose continued existence is in doubt. The world is full of

发表于:2018-12-07 / 阅读(134) / 评论(0)

世界上最伟大的演讲

太阳科普第6期

The composition of the sun lies in this bar code. 这个条码说明了太阳的组成 All the thin lines are caused by tiny amounts of complex elements 这些细细的线条，都是微量复杂元素造成的 metals like iron and magnesium. 好比说

发表于:2018-12-07 / 阅读(179) / 评论(0)

太阳科普

Uses Hydrogen1 as Fuel2

Broadcast: February 14, 2003 By George Grow This is the VOA Special English Environment Report. President Bush has offered a plan to speed development of technology that uses hydrogen as fuel. His goa

发表于:2018-12-07 / 阅读(174) / 评论(0)

VOA2003（上）-科技导航

我们该选择死亡吗？

I am speaking not as a Briton, not as a European, not as a member of a western democracy, but as a human being, a member of the species Man, whose continued existence is in doubt. The world is full of conflicts: Jews and Arabs; Indians and Pakistanis

发表于:2018-12-12 / 阅读(144) / 评论(0)

英语演讲

CNN 2009-11-25

I couldn't get over this mess. The federal government is confirming what Joan Glickman of Pompano Beach, Florida suspected all along. Tainted drywall from China is giving off a harmful gas that's turning her air-conditioning wiring black, causing it

发表于:2018-12-20 / 阅读(132) / 评论(0)

cnn2009年(十一)月

SSS 2012-03-28

This is Scientific Americans 60 Second Science, I am Cynthia Graber, this will just take a minute. Compounds found in the herb thyme have antibiotic properties. Now scientists have demonstrated that thyme might have a future role in fighting acne. A

发表于:2018-12-24 / 阅读(202) / 评论(0)

Scientific American(三)月

日光将薄的塑料屏障变成了杀菌材料

Daylight Turns Thin Plastic Barrier into Germ-Killing Material Daylight-powered germ-killing equipment may someday help protect health workers from deadly microorganisms like Ebola virus disease. That is a finding from a study published in the journa

发表于:2019-01-03 / 阅读(104) / 评论(0)

2018年VOA慢速英语(四)月

SSS 2008-08-01

This is Scientific Americans 60-Second Science. I am Cynthia Graber. This will just take a minute. Solar panels typically convert sunlight into electricity or heat. But photosynthetic vegetation converts sunlight into chemical energy. Now M.I.T.s Dan

发表于:2019-01-04 / 阅读(173) / 评论(0)

Scientific American(八)月

美联社新闻一分钟 2006-08-11

1. US intelligence officials say the 24 suspects arrested in an airplane terror plot were targeting ten flights from Britain to a number of US airports. They apparently planned to ignite a peroxide -b

发表于:2019-01-08 / 阅读(193) / 评论(0)

美联社新闻一分钟2006

德国开辟生物制氢研究新途径

BERLIN, April 25 (Xinhua) -- A study recently published in the journal Nature Chemical Biology opens up new avenues in biohydrogen research, the Technical University of Berlin (TU Berlin) said on Friday. Scientists at the TU Berlin succeeded in expla

发表于:2019-01-26 / 阅读(114) / 评论(0)

英语新闻

纽约车展上电动汽车来势汹汹

NEW YORK Plug in your car, then unplug, and drive away. More and more consumers are doing just that. At the 2014 New York Auto Show many automakers unveiled electric or hybrid vehicle to address the growing global appetite for environment-friendly ca

发表于:2019-01-30 / 阅读(145) / 评论(0)

英语新闻

Vitamin C and DNA

67 维生素C能否破坏DNA？ DATE=7-11-01 TITLE=SCIENCE REPORT - Vitamin C and DNA BYLINE=Nancy Steinbach (Start at 59

发表于:2019-01-30 / 阅读(173) / 评论(0)

科技之光

联合国考虑对朝鲜新制裁

SEOUL/WASHINGTONThe U.N. Security Council said Wednesday that it was working to craft new sanctions against North Korea after its latest nuclear test, while the United States and other world powers voiced skepticism about Pyongyang's claim that the u

发表于:2019-02-04 / 阅读(99) / 评论(0)

英语新闻

托福考试：TOEFL模拟试题

Questions 12-20 The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measur

发表于:2019-02-05 / 阅读(174) / 评论(0)

托福英语

雅思单词前缀整理

PREFIX 1.a-:of;on;intensive;negative,not,without;ad-;ab-. 2.ab-:away from,off. 3. ad-:to;at;for. 4. aer(o)- :relating to air . 5.al-:all. 6.ambi-:on both sides,around. 7.amphi-:on both sides,around. 8.an-:negative,not,without. 9.ana-:upon,up,on. 10.a

发表于:2019-02-06 / 阅读(184) / 评论(0)

雅思英语

我们该选择死亡吗

December 30, 1954 I am speaking not as a Briton, not as a European, not as a member of a western democracy, but as a human being, a member of the species Man, whose continued existence is in doubt. The world is full of conflicts: Jews and Arabs; Indi

发表于:2019-02-09 / 阅读(184) / 评论(0)

英语美文

早安英文第434期:各种护肤品用英语怎么说

benzoyl 苯甲酰 peroxide 过氧化物 inflammation 发炎 hyaluronic acid injections fillers 注射玻尿酸填充 facial cleanser 洗面奶 firming facial toner 紧致爽肤水 sunscreen/sunblock 防晒霜 facial mask 面膜 body lotion 润体乳

发表于:2019-02-16 / 阅读(122) / 评论(0)

早安英文

各种花样的风筝怎么说？

9月16日是墨西哥馆日，墨西哥馆五颜六色的风筝森林吸引了不少人的眼球，你知道小小的风筝里有什么大学问吗？其实风筝也有很多种分类哦，一起来看看吧。说到kite这个单词，这也许是我们

发表于:2019-02-18 / 阅读(198) / 评论(0)

英语口语

朝鲜宣布成功进行首次氢弹试验

North Korea conducted a 'successful' hydrogen bomb test, Pyongyang has confirmed. The thermonuclear weapon triggered a massive 5.1 magnitude earthquake when it exploded at 10am local time on Wednesday. 平壤方面已经证实，朝鲜成功的进行了

发表于:2019-02-18 / 阅读(119) / 评论(0)

英语新闻

万物简史第383期:浩瀚的海洋(2)

Almost nothing about it can be used to make reliable predictions about the properties of other liquids and vice versa. 它的身上几乎没有哪一点可以用来对别的液体的性质进行可靠的推测，反之亦然。 If you knew nothing of

发表于:2019-02-25 / 阅读(133) / 评论(0)

万物简史

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

AAP (analyst assistance program)