And when we're talking about the amplitude of the wave, we're talking about the deviation from that average level. So, if we define the average level as zero, you can have either a positive amplitude or a negative amplitude.

当我们讨论一个波的振幅时,我们说的是偏离平均位置的量,如果我们把平均位置,定义为零的话，那幅值不是,正的就是负的，有时候人们在。

麻省理工公开课 - 化学原理课程节选

We could say an energy level diagram 0 This would be energy. Here is zero.

我们可以画一个能量图,这是能量，这里是。

麻省理工公开课 - 固态化学导论课程节选

The disease model,the optimum level is the zero: let's just be Ok; let's just not hurt.

对疾病模型而言，最优水平是零：,我们都平平安安，别受伤就好了。

哈佛公开课 - 幸福课课程节选

If you want to get some input from the user, my God I don't want to have to program it to low level zero and 1 just to get keys from the keyboard; please let there have been someone who does that for me and indeed there are an increasingly sophisticated options that you can pull off the shelf.

如果你想获得一些用户的输入数据，我的上帝,我可不希望在键盘上敲入0，1的低水平方式来编程;,希望有个人能帮我做这件事吧,但是现有的选择,也变得日益复杂了。

哈佛公开课 - 计算机科学课程节选