We learn first-hand about the principles of gravity the first time we fall down, and we experience many other physical laws early on in our lives.

我们在第一次摔倒的时候就学会了重力原则，我们在小的时候就感受到了许多其他的物理法则。

youdao

We learn first-hand about the principles of gravity the first time we fall down, and we experience many other physical laws early on in our lives.

我们在第一次摔倒的时候就学会了重力原则，我们在小的时候就感受到了许多其他的物理法则。

youdao