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1.To show why it is that the Moon changes shape ask someone to hold up a white ball and walk round a light with it.
为了表示为什么月亮改变形状，让人拿着一个白色的球然后绕着灯走。收藏指正
2.In 1971, when astronaut Alan Shephard, watched by millions of viewers, hit a golf ball on the moon, golf became the first sport in space.
1971年,在数百万观众的注目下,宇航员艾伦·谢泼德在月球上击打了一杆高尔夫球,从此高尔夫成了第一项在太空展开的运动。收藏指正
3.A ball has a gravitational pull of its own, but this is very small in relation to the pull of something as large as the moon, the earth, or the sun.
球有自己的引力，但这对于像月球、地球、大阳这样大的物体的引力来说就非常小了。收藏指正
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