由于月球没有大气层，它的表面不会受到侵蚀，所以它保留了早期历史的痕迹。
Because the Moon has no atmosphere, its surface is not subject to erosion, so it retains the marks of its early history.
月球没有大气层，因而能充分接受阳光照射，有丰富的太阳能可供利用。
The Moon, which lacks an atmosphere, receives abundant, energy from the Sun.
一旦旗子被动过，由于月球没有大气，也就没有了空气阻力，它反而要过很久才能停下来。
When it is set in motion, the lack of atmosphere and hence air resistance mean the flag takes a long time to settle.
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