在三维空间中，球同样是中心对称的。

In three dimensions, a sphere is likewise symmetrical under all rotations about its center.

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比方说，圆是中心对称的。

A circle, for example, is symmetrical under all rotations about the center of the circle.

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回文指的是前后读相同的中心对称的字符序列。

A palindrome is a symmetric character sequence that looks the same when read backwards, right to left.

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So, we'll talk about this other axis of style on the course, writing code that looks pretty and as well aesthetically laid out.

我们来讨论一下这个中心对称的程序，这程序写出来的结果很漂亮,完全按照美学角度摆放。

哈佛公开课 - 计算机科学课程节选