这就是球面上，对单连通的定义。

OK, so that's the definition of the surface of a sphere being simply connected.

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单橡木皮的外底和高质量的完成自定义脚跟。

Single oak leather outsole and a custom heel for a quality finish.

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首先给出＂单谷函数＂的定义；

In this scheme a definition of "Unique valley function"(U.

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首先给出＂单谷函数＂的定义；

In this scheme a definition of "Unique valley function"(U.

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