你女儿给你带来了一些她今天下午自己摘的花。

Your daughter brought you some flowers that she picked herself this afternoon.

youdao

你把自己的架子搭起来了吗？

Do you put your own shelves up?

youdao

但是如果你挺过来了，你就能真正地证明自己基因地良性品质。

But if you survive, you really have proved the quality of your genes.

youdao

Conversely, if you get an answer and it doesn't seem to make sense, then you've got to go back and ask, am I violating some of the assumptions, and here you will find the assumption that the particle had that acceleration a is true as long it's freely falling under gravity but not when you hit the ground.

反过来说,如果你得到一个结果,发现似乎是错的,那么你就应该回过头来问问自己,我是不是违反某些前提了,这个模型中,你就发现,只要质点在重力作用下自由下落,质点具有加速度a的前提是正确的,但是落地后就不成立了

耶鲁公开课 - 基础物理课程节选