单词：planetary gear train
单词：planetary gear train 相关文章
SCIENCE IN THE NEWS - Gore's Movie Heats Up Discussion of Global Warming (and Has His Critics Steaming)By Caty Weaver and George Grow Broadcast: Mon, 3 Jul 2006 16:00:00 UTC (MUSIC) VOICE ONE: This is
2006年慢速英语（七）月
This is Scientific Americans 60-Second Science. Im Christopher Intagliata. Got a minute? Astronomers have already discovered hundreds of exoplanets. But make way for the new kid, which is orbiting a kind of star that models say it shouldnt. Researche
Scientific American(十一)月
Like a phoenix rising from the ashes, astronomers have found a whole new solar system may be forming in the wake of a star's violent death. This is the Hidden Universe of the Spitzer Space Telescope, exploring the mysteries of infrared astronomy wit
国家地理2008年
This is Whats Trending Today. Last week, the American space agency NASA announced it was looking for a Planetary Protection Officer. Many people discussed the job on social media. The Washington Post called the jobs title one of the greatest ever con
2017年VOA慢速英语(八)月
By David McAlary U.S. astronomers have made a finding they say increases the chance that distant stars may harbor planetary systems like our own. They have discovered two planets the size of Neptune e
VOA2004（下）--健康科技
PISCES February I9 to March 20 The Piscean is the ideal silent partner. When actively engaged in a partnership, he is apt to be too indecisive, and either too suspicious or too trusting. His emotions invade everything and they are not clear-sighted.
趣味英语