萨姆,缓血酸胺,三羟甲基氨基甲烷

SSS 2011-04-11

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Landfills produce methanewhich can be valuable as an energy source. But scientists haven't known why landfills make so much methane. The solid waste in

发表于:2019-01-08 / 阅读(106) / 评论(0)

Scientific American(四)月

英语歌曲:I'just little bit shy-Natasha thomas

I'just little bit shy-Natasha thomas Dam dam dubi do Tell me what can I do I'm just a little bit shy Dam dam dubi do I really don't know why I'm just a little bit shy I try to tell you uh that I love you what can I do do what can I do Obsession forev

发表于:2019-02-02 / 阅读(63) / 评论(0)

好听的英文歌曲

VOA标准英语2010年-Meth Still Grips, But Doesn't Strangle

Raw anti-drug campaign awakens state Ted Landphair | Missoula, Montana 04 February 2010 Photo: Montana Meth Project Adults across Montana were frightened by what they were seeing. Some hardly recognized their meth-addled teenagers. Related Links Mont

发表于:2019-02-02 / 阅读(52) / 评论(0)

VOA标准英语2010年(二月)

音乐咖啡厅:Shy Girl

Shy Girl -O Town Shy shy girl Shy Girl Yeah, Yeah Standing with the wallflowers Wishing you would've stayed at home You kick yourself for coming When you're standing there all alone The centers of attention are busy making all their Oh Girl... While

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音乐咖啡厅

环球英语 — 181：Crystal Meth: A Drug Problem

Voice 1 Hello. Im Ruby Jones. Voice 2 And Im Marina Santee. Welcome to Spotlight. This programme uses a special English method of broadcasting. It is easier for people to understand, no matter where in the world they live. A small candle burns. It re

发表于:2019-02-21 / 阅读(64) / 评论(0)

环球英语 Spotlight

英语听力文摘 English Digest 247、呼吸甲烷

A Fresh Breath of Methane 很早很早以前地球有很微量的氧气，而且地表状况十分恶劣。大气主要是N2和Co2，后来通过复杂的变化，地球开始出现了厌氧型生物。在生命的作用下，地球的氧气开始不断

发表于:2019-03-09 / 阅读(96) / 评论(0)

英语听力文摘 English Digest

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active defect

aedes (stegomyia) desmotes

atmospheric circulation

authorization form

bathyraja isotrachys

bird-cherry ermine