We often use a pen to write.

我们经常用钢笔写字。

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We often use it to describe some uproarious festivities.

我们通常用它来形容一些骚动的庆典。

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But today we often use broccoli and other veggies with dips.

但是现在我们通常吃椰菜和其他蔬菜的时候才用酱蘸着吃。

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One way to think about it, if we want to use a classical analogy, which often helps to give us an idea of what's going on, is the spin of an electron, we can picture it rotating on its own axis.

如果我们用一个，经典的比喻来考虑它的话，这经常会帮助我们建立起一些概念，就是我们可以把电子的，自旋想象是它绕着轴自转。

麻省理工公开课 - 化学原理课程节选

So that means that we don't have to worry about things like wave functions when we're talking about Lewis structures, but because they're so simple to use and because they so often predict the electron configuration of molecules accurately, we end up using them all the time in chemistry, so it's very valuable to know how to draw them correctly and to know how to work with them.

因此这也就意味着我们在讨论路易斯结构的时候,不需要担心波函数之类的东西，但是由于路易斯结构不仅简单易用,而且用它来预测分子的电子排布,经常可以得到非常精确的结果，结果我们在化学中一直都在用它，因此知道如何正确地画出并运用,路易斯结构是非常有价值的。

麻省理工公开课 - 化学原理课程节选

The most common one and the one we're going to use, is what's often called big Oh notation.

也就是我们即将用的方法,就是通常被叫做大O的方法，它叫大O并不是因为。

麻省理工公开课 - 计算机科学及编程导论课程节选

We often use it because it's a good indicator of what's going on.

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We often use California as an example because it was so exaggerated.

CNN: Transcript of May 'CNN Money Summit: Money & Main St.'

Maybe just the advertising of that or maybe, for example, in the classic example we often use is the history of art survey where you go back and look at things, like some of the great pieces - works of art of over our history which probably sometimes do depict naked children.

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