我们说过，以今天的标准来看，20年代和30年代的许多电影会被认为是混合起来的。

We said that by today's standards, many of the films of the 20s and 30s would be considered hybrids.

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衍生品试图以今天已知的市场价格为基础推导出一个未知的价格。

Derivatives model an unknown price from today's known market prices.

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以今天相同的覆盖区域，一家企业必须达到将近240个地区的覆盖面。

To achieve the same coverage today, a company must be in nearly 240 locations.

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What we had just done a clicker question on is discussing light as a particle and the photoelectric effect, so we're going to finish up with a few points about the photoelectric effect today.

我们刚才做得课堂表决器那个问题,是讨论光作为一个粒子以及光电效应，所以今天我们将以一些,关于光电效应的观点作为结束。

麻省理工公开课 - 化学原理课程节选

We're going to really get into this next class, but I just want to introduce it to you to give us a start, and many of you have used Lewis structures in high school, but we'll be doing some much more challenging Lewis structures, I can assure you, in this class here.

其实我们下节课才会详细介绍它，但是今天我只想以简单介绍作为开始，大部分同学在高中就用过路易斯结构了，但是我们会遇到一些更具挑战性的,路易斯结构，我可以向大家保证，在这门课中会的。

麻省理工公开课 - 化学原理课程节选

But I want to begin today with another passage, from the war years, and ask now from a Northern point of view, how do we get to Uriah Parmelee?

但是今天我要以另外一篇文章做开始,自开战那年,从北方角度来看,我们要如何理解乌利亚·帕米利

耶鲁公开课 - 美国内战与重建课程节选