Such as the moon revolves around the earth, the moon is between the earth and the due to gravity.
比如说月球围绕著地球转,就是月球和地球之间的万有引力造成。
NASA has not yet chosen its next objectives for human space travel, but they include deep-space targets such as the moon, Mars and various asteroids.
美国NASA除了选择了深太空,如月球、火星及不同的小行星以外,还没有选定人类以后的太空旅行的目标。
Astronomy is the scientific study of the universe as a whole and of objects which exist naturally in space, such as the moon, the sun, planets and stars.
天文学是一项针射整个宇宙以及自然存在于宇宙内的天体,如月球、太阳、行星和恒星的科学研究。
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