任何事情都像一枚硬币有两个面一样。

There are two sides of coin for everything.

youdao

一个硬币有两个面，一部分学生认为，学校本来就是一个学习知识的地方，我们去那就是需要坐那好好学习。

One coin has two sides, some students think that school is a space to learn the knowledge, the only thing we should do is staying there to study.

youdao

我终于懂得不管你把一件东西切割得多薄，它总是有两个面。我终于懂得你应该永远把温暖的话语留给你爱的人。

I've learned that no matters how thin you slice it, there are always leave loved ones whit loving words.

youdao

pxa So what happens when we add a 2 p a and we subtract from it a 2 p x b, or the same with a 2 p y a subtracting a 2 p y b, is that we're actually going to cancel out the wave function in the center, so we now have 2 nodal planes.

当我们用,减去2pxb时，或者是2pya减去2pyb时，我们会消去,中间的波函数，所以现在我们有两个节面。

麻省理工公开课 - 化学原理课程节选