Remember last time at the end of class we were trying to figure out what exactly happens near the bottom point, when we have this motion that seems to stop and go backwards.

记得上次在课结尾时我们，尝试计算接近最低点的运动，它看上去似乎静止及后退的趋势。

youdao

So what we see in the publishing history of Black Boy and also in its reception brings us back to those questions that I was raising at the beginning of class.

黑孩子》的出版经历,以及出版之后的反响,让我们又回到了我一开始提到的那些问题。

youdao

However the client does need to know what methods the service offers, so finally we get to use the abstract base class which we defined right at the beginning. The sample.h.

不过，客户机并不需要知道提供了哪些方法和服务，因此，最终我们要使用在开始时定义的抽象基类。

youdao

So, the example that we took on Monday and that we ended with when we ended class, was looking at the 1 s orbital for hydrogen atom, and what we could do is we could graph the radial probability as a function of radius here.

周一我们,最后讲到了，粒子是氢原子１ｓ轨道，我们可以画出,这幅径向概率分布曲线。

麻省理工公开课 - 化学原理课程节选

So, for example, when people, and we'll talk about this next class, were looking at different characteristics spectra of different atoms, what they were seeing is that it appeared to be these very discreet lines that were allowed or not allowed for the different atoms to emit, but they had no way to explain this using classical physics.

举个例子，当大家看到,不同原子的特征光谱时,他们看到的是一些分离的线,那可以使不同的原子,发射或不发射出去，但是这些无法用经典物理来解释。

麻省理工公开课 - 化学原理课程节选

We should at least do what we agree on, and that's to keep middle-class taxes low.

WHITEHOUSE: Remarks by the President in a News Conference

What if we had had the chance to take the class online, at our own pace, with concepts explained multiple ways until we grasped it?

FORBES: Beyond School Choice