[机] 修补

Astronauts at the International Space Station have overcome initial fears and are preparing to perform the first spacewalk beneath the shuttle to repair two dangling pieces of material. The material, used to fill gaps between tiles, is sticking out b

发表于:2018-12-05 / 阅读(39) / 评论(0) 分类 英语听力文摘 English Digest

Have you ever thought about your biological clock? Never! No. Men don’t have to think about that. Men may not think about their biological clocks, but they should. There are some men whose biologica

发表于:2018-12-11 / 阅读(57) / 评论(0) 分类 万花筒2006年

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ? Germanys Harald zur Hausen and Frances Luc Montagnier and Francoise Barre-Sinoussi share the 2008 Nobel Prize in Physiology or Medicine, awarded October 6th. Barre-Sin

发表于:2019-01-08 / 阅读(58) / 评论(0) 分类 Scientific American(十)月

[00:22.13]Xiao Hu:Can you help me,Dick? [00:35.27]Dick:Yes.What is it? [00:37.88]Xiao Hu:I'm going to repair the window. It's broken. [00:42.71]Dick:What can I do for you? [00:45.14]Xiao Hu:Hold the ladder for me,please [00:48.35]Dick:OK.But be caref

发表于:2019-01-09 / 阅读(121) / 评论(0) 分类 小学英语北京版

By Margaret Besheer Washington 03 November 2007 NASA astronauts have successfully repaired a damaged solar wing at the International Space Station. The operation was completed Saturday, after being postponed twice so engineers could further study how

发表于:2019-01-31 / 阅读(57) / 评论(0) 分类 VOA常速英语2007年(十一月)

An international group of scientists has engineered an enzyme which they say will be able to eat some of the most common plastic. It's being touted as a possible way to fight pollution. Improvements aimed at making the enzyme work more effectively ar

发表于:2019-02-22 / 阅读(76) / 评论(0) 分类 2018CRI中国国际广播电台
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aminothiol
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Austrocedrus chilensis
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