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OK, so that's the definition of the surface of a sphere being simply connected.
这就是球面上，对单连通的定义。
youdao
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The bed surface rotating device is connected with the bed surface.
床面旋转装置连接床面。
youdao
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The bed surface rotating device is connected with the bed surface.
床面旋转装置连接床面。
youdao