潮汐是月亮引力作用的结果。

The tides depend on the pull of the moon.

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根据1915年爱因斯坦发表的《广义相对论》,空间似乎是一个引力作用的曲线维度。

Einstein theory of general relativity 1915, space, its seems, is gravitationally curved.

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天文学家的理论是，当一个巨大的物体在其自身的引力作用下灾难性地收缩，只留下一个强大的引力场，且没有任何东西能逃脱时，黑洞就形成了。

Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it.

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Everything -- gold, silver, diamonds, particles -- everything accelerates the same way in a gravitational field, due to this remarkable fact.

所有东西,金,银,钻石,粒子,所有东西,在引力场作用下都以相同的方式加速,原因就是这个显著的事实

耶鲁公开课 - 基础物理课程节选

Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

耶鲁公开课 - 基础物理课程节选

Newton finds out there's a force of gravity acting on everything.

牛顿发现所有的物体都受到引力作用

耶鲁公开课 - 基础物理课程节选