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1·It is to get the rocket going fast enough to escape Earth's gravity.

是为了让火箭的速度足够快，足以逃离地球的引力。

2·The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.

地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。

3·Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.

逃逸速度就是一个物体的速度，比如说，从加农炮中射出的最小初始速度，这样这个物体以后就可以自己脱离地球的引力。

4·This is the fixed part of the Earth's gravity.

这是地球引力的固定部分。

5·And if the earth's gravity seems strong, imagine the pull of the sun.

姑且地球的引力已经够大的了，设想一下太阳的引力该有多大。

6·Lifting heavy spacecraft and fuel out of the Earth's gravity is expensive.

将沉重的航天器和燃料送出地球引力以外费用昂贵。

7·Though an ion engine could never lift a spacecraft out of Earth's gravity well.

尽管离子发动机不能使航天飞机很好地摆脱地球引力。

8·Scientists have unveiled the most accurate map ever produced of the Earth's gravity.

科学家们发布了一副最为精确的地球重力地图。

9·A problem to find reasons from yourself, don't blame a constipation earth's gravity.

出问题先从自己身上找原因，别一便秘就怪地球没引力。

10·As you go up a mountain, you have to overcome the earth's gravity which pulls you down.

上山时你必须克服把你往下拉的地球引力。