单词：harmonic gear drive mechanism
单词：harmonic gear drive mechanism 相关文章
ARI SHAPIRO, HOST: The editorial boards of the Miami Herald, Palm Beach Post and South Florida Sun Sentinel are working together to issue a warning with help from WLRN public media. They want people to take the threat of sea level rise seriously. Fre
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ELISE HU, HOST: The world's oceans are rising up about eight inches on average over the past century. The seas are rising more in some places than others. As NPR's Christopher Joyce reports, scientists are beginning to predict where the rise will be
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By Paul Sisco Washington, DC 01 February 2008 Scientists know that the waters north of Greenland, around the Arctic Circle, significantly influence global weather patterns. But until recently, they only have been able to measure the region's deep oce
VOA常速英语2008年（二月）
Once upon a time the rivers combined against the sea，and con-verging into a whole，accused her，Why is it that when we rivers pour our water into you so fresh and Sweet，you straightway render it salty and unpalatable？The sea，observing the t
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By Phil Mercer Sydney 09 November 2009 Scientists say that along the coast of Western Australia sea levels are rising at a rate double that of the world average. Statistics from Australia's National Tidal Center show sea levels have increased by 8.6
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