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8. Education is ____ for the development of a country. A. indispensable B. accountable C. deliberate D. deficient indispensable a.不可缺少的 n.不可缺少之物 accountable 可计算的 account
A Stationary Satellite, part 2 A geostationary satellite orbitsthe planet at the same rate as the planet rotates, so the satellite is always over the same patch of ground. Cool! you say. Id like to have one of those about twenty feet over my house. S
Some of the issues that are important if you want to have people in space for long periods of time. 如果人类想长期置身太空,有几个重要的问题不得不考虑。 One is that people will tend to lose bone and muscle mass. 其中之一就
今天分享的是一首总在记忆深处感动你的歌。 重点词汇 anchor n. 锚; 锚状物; 靠山; 压阵队员; bottomless adj. 无底的; 无限的; 裸体的; 无尽的事物; gravity n. 重力; 万有引力,地心引力; 重要性,严重
Why not? You cry.Well,ask yourself this question: which one is easier to move in the first place? The golf ball. So it takes more force to move the bowling ball. And the bowling ball is also the one gravity pulls on more. See the connection? A more m