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- Planetary perturbations make the earth's orbit about the sun irregular. 行星的摄动使得地球绕太阳的轨道是不规则的。
- The "weightless" condition of astronauts in orbit about the earth arises from just this cancellation of inertial and gravitational forces. 在围绕地球运转的轨道中,宇航员的“失重”状态就是惯性力与引力相互抵消的结果。
- In the next fifteen years or so, there could be a fleet of fifty spaceplanes carrying a million people into orbit about the Earth each year, at $10,000 per head . 在今后大约15年间,每年将可能有一队由50架太空飞机组成的机群载着100万名乘客进入地球轨道,收费标准为每位乘客10000美元。
- Planetary perturbations make the earth's orbit about the sun irregular 行星的摄动使得地球绕太阳的轨道是不规则的。
- As time goes on, we know more about the earth. 随着时间的推移,我们对地球将更加了解。
- It was from the study of these that so much was learnt about the interior of the earth. 通过对这些的研究,我们了解了大量有关地球的内部情况。
- The "weightless" condition of astronauts in orbit about the earth arises from just this cancellation of inertial and gravitational forces 在围绕地球运转的轨道中,宇航员的“失重”状态就是惯性力与引力相互抵消的结果。
- An important task of the space shuttle is to launch a space telescope and place it in an orbit about 500 kilometers above the earth. 航天飞机的一个重要任务是释放太空望远镜,使其进入离地面500公里的轨道。
- The professor theorized about the age of the earth. 教授从理论上推测了地球的年龄。
- This book is about the earth's magnetism. 这本书是有关于地磁的。
- The earth revolves round about the sun . 地球绕太阳旋转。
- Space exploration helps us learn about the Earth. 太空探险帮助我们更多地了解地球。
- NASA's Mars Global Surveyor, currently in orbit about the Red Planet, is finally providing some final answers. 最近环绕这颗红色行星轨道运行的nasa的全球监测机构最终提供了一些可靠的答案。
- NASA's Mars Global Surveyor,currently in orbit about the Red Planet,is finally providing some final answers. 最近环绕这颗红色行星轨道运行的NASA的全球监测机构最终提供了一些可靠的答案。
- I'll put a girdle round about the earth in forty minutes. 我可以在四十分钟内环绕世界一周。
- He professed to know nothing about the matter. 他声称对此事一无所知。
- That the earth circles about the sun once is called a year. 地球围太阳转一圈称为一年。
- Knowledge about the age of the earth and the sun was very hazy. 人们对地球和太阳年龄的认识相当模糊。
- Don't be unduly worried about the exam. 不要过分担心考试的事。
- "You only think about the earth, but consider the sky and the sea. 兰色打断了它的话:“你只考虑了地上,想想天空和海洋吧。