As it goes up, gravity affects it and slows down (Ease In), then it starts its downward motion more and more rapidly (Ease Out), until it hits the ground.

当他上升时，重力影响它使它变慢(缓入)，然后开始下降时动作就越来越快速(缓出)直到它弹跳到地面。

youdao

And, as I said, this is done through noting the equivalence of gravity and accelerated motion.

而且，像我所说的，这个是通过观察引力场和加速运动的的等效完成的。

youdao

Newton proposed that heavenly and terrestrial motion could be unified with the idea of gravity.

牛顿提出天体和地球的运动可以用万有引力来解释。

youdao

The law, of course, is not a real law, such as Newton's laws of gravity and motion.

FORBES: THE HUMAN ROLE

He expressed for the first time accurate laws of motion, the origins of colours, the existence and effects of gravity, and the fact that the same physical laws hold true throughout the universe.

ECONOMIST: Isaac Newton