首先，我们不得不考虑我们的矩形的几何结构。

First, we have to think about the geometry of our rectangle.

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古典数学家相信这个数字代表了最美观的矩形的尺寸，不过它一般出现在计算数学中。

Classical mathematicians believed that this number represented the most aesthetically pleasing ratio for the dimensions of a rectangle, but it also turns up in computational mathematics.

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激活钢笔工具。按较低的矩形的边添加新的点。使用直接选择工具把它拉下来。

Activate pen tool. Click lower side of the rectangle to add new point. Use Direct Selection tool to pull it down.

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That's the work that the system is doing to the environment. I'm doing work to the environment. The work is negative, which means that work is being done to the environment.

功的大小,就是矩形的面积,这样我们就实现了一台热机，冷却，加热，加热,冷却，系统回到了初态。

麻省理工公开课 - 热力学与动力学课程节选

Anyway, the work associated with process number two is described by this box.

好，刚才那个过程的功,由这个矩形描述。

麻省理工公开课 - 热力学与动力学课程节选

And in the ancient world, the reason for this was that this very small rectangle--;it's about 150 miles long and 70 miles wide, about the size of Rhode Island--this very small rectangle lies on the way to anywhere worth going in the Ancient Near East.

在古代，战争的原因是,这小块矩形，长150公里，宽70公里，与罗德岛大小相当，这小块矩形处于要道,这条路通向古代近东的任何地区。

耶鲁公开课 - 旧约导论课程节选