引力一直都是存在的，只是牛顿“发现”了引力。

Gravity had always been, but Newton "discovered" it.

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牛顿发现宇宙中任何两个物体都相互吸引，而且这股引力与它们的质量成比例。

Newton discovered that any two objects in the universe attract each other, and that this force is proportional to their mass.

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牛顿在一棵苹果树下坐了许多年，最终发现了可以支配整个地球的最伟大的宇宙法则之一。

Newton, siting for many years under an apple tree, eventually figured out one of the greatest universal rules that govern the whole globe.

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Suppose Newton comes to you and says, "I have this great law, but I don't want to publish it under my name.

假如牛顿对你说,"我发现了这个伟大的定律,但我不想以我的名义发表

耶鲁公开课 - 基础物理课程节选

The great discovery that Galileo and Newton made is that you don't need a force for a body to move at constant velocity.

伽利略和牛顿的伟大发现就是,物体不需要力来维持匀速运动

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