Black holes exert a strong gravitation pull.
黑洞产生很强的引力。
It follows that the Moon's orbit is primarily determined by the gravitation pull from the Sun, so the orbit of the Earth will always curve towards the Sun.
由此断定月球的轨道主要由来自太阳的牵引力决定，所以地球对于太阳的轨道一直是椭圆形的。
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。
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