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1·Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

2·What is the force of gravity at sea level?

海平面的地球引力多大?。

3·She is a force of gravity in her long gray dress.

灰色长裙下的她就像一股地心引力牢牢将他吸住。

4·The force of Gravity makes things fall to earth.

地球引力使物体落到地面上。

5·The force of gravity makes things fall to ground.

重力使物体都落到地上。

6·Obviously the force of gravity is acting vertically downward.

显然重力的作用垂直向下。

7·The force of gravity on the moon is much less than on the earth .

月球的引力比地球上的引力小得多。

8·All objects are pulled towards the centre of the Earth by the force of gravity.

所有的物体都由于引力而拉向地球中心。

9·During launch of the Soyuz craft, cosmonauts experience four times the force of gravity.

在联盟号发射的时候，宇航员所承受的是4倍的重力加速度。

10·By blowing downward these fans oppose the force of gravity, effectively lightening the vehicle.

通过向下吹风，这些风扇可以抵消引力，有效地减轻探测车的重力。