甲氧乙吡啶

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

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Scientific American(四)月

纪录片:墨西哥打击贩毒集团

AS IT IS 2015-09-20 Documentary Shows US, Mexico Fighting Drug Cartels 纪录片:墨西哥打击贩毒集团 A new movie follows two communities -- one in the United States and the other in Mexico -- as they try to stop drug cartels from harming thei

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2015年VOA慢速英语(九)月

VOA标准英语,Drug,US,Author

Synthetic Drug Problematic for US Authorities Augusta County, Virginia, is a rural county in the Blue Ridge Mountains, two and a half hours southwest of Washington. It has a big problem. Sheriff Randy Fisher says Augusta County was once known as the

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VOA标准英语2012年(六月)

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

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VOA标准英语2010年(二月)

2007年VOA标准英语-Yazidi, Muslim Leaders in Kurdistan Condemn Rec

By Brian Padden Irbil, Iraq 17 August 2007 The death toll from a series of suicide attacks on Iraq's Yazidi sect on Tuesday continues to rise. Officials now estimate at least 400 people were killed and hundreds more wounded when four truck bombs expl

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2007年VOA标准英语（八月）

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

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accelerating death phase

acrylate coated fiber

admissible hypothesis