For example the regular expression a (b (C)) has the subgroups (b (C)) and (C).

例如，正则表达式a (B (C))包含子组(B (C))和(C)。

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C So, we have a curve in the plane, c.

平面上有一条曲线。

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For example, type ls [a-c] to find the files named a, b, and c.

例如，键入ls [a -c]以查找名为a、b或c的文件。

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The two basic movement patterns of an Economic Central City (E. C. C) are centralization and diffusion.

经济中心城市具有集聚和扩散这两种基本运动形式。

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The two basic movement patterns of an Economic Central City (E. C. C) are centralization and diffusion.

经济中心城市具有集聚和扩散这两种基本运动形式。

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