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诸多线索综合起来为我们描绘出一幅画面：那是火星遥远的过去，那时的火星还有着一层厚厚的大气层，令这颗星球温热暖和，从而使水能够在火星表面流淌。但如今，地表的水消失不见，而
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a wonderful meal 美美地吃一顿 campfire 营火 comfortable 舒服的 creep 爬，爬行 feel tired 感觉累了 field 田地 form 形成 heavily 大量地 leap 跳跃 put out 熄灭 put up 搭起，建起 right 正好 sleep soundly 睡得香 sle
新概念英语第二册单词MP3
The clues are adding up to give a picture of a distant Martian past, when the planet had a thick atmosphere that was warm enough for water to stream on the surface. But now the waters gone, and the atmosphere is so thin that any water would boil away
Scientific American(十)月
SAN FRANCISCO, April 19 (Xinhua) -- YouTube announced Tuesday that the much-anticipated British royal(王室) wedding of Catherine Middleton and Prince William will be live streamed on the website' s live channel. Next Friday, the live stream will fo
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Volunteers, farmers and local government in Pennsylvania community work to clean up waterways. Rosanne Skirble | Lititz, Pennsylvania 30 November 2009 Watch: Skirble report Windows Media Lititz Run prior to restoration with eroded stream banks and fe
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One rural farmer found out exactly how much it would cost for his local Internet service provider to extend their network outside of the service area, and it was a pretty scary number. To be exact, Windstream Communications was going to charge Nelson
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