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

If nothing is touching the body, there are no forces on it, with one exception which is, of course, gravity.

如果没有实体接触,那么它就不受作用力,当然一个例外那就是引力

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

It plays a big role in gravitation, in the Coulomb interaction.

它在引力和库仑力中都起着重要的作用

耶鲁公开课 - 基础物理课程节选