One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth and is like a rope which keeps the satellite from flying away.
其中一个是地心引力的力量，这股力量试图把卫星拉向地球，就像一根把卫星绑住的绳子，防止卫星飞远了。
Gravitation is the force which holds all the atoms of a star together.
引力是把一个恒星上所有的原子聚集在一起的力量。
Newton's law of gravitation refers to the force between two particles.
牛顿的万有引力定律指的是两个质点之间的力。
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