最后再用不同的颜色填充这些封闭的区域。

You eventually fill the closed area with various colors.

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只需在区域中取一条封闭曲线。

Well, you just take a closed curve in the plane.

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保税区是个孤立、封闭的区域，经常濒临海港。

A free trade zone is an isolated, closed area, usually adjacent to a sea port.

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保税区是个孤立、封闭的区域，经常濒临海港。

A free trade zone is an isolated, closed area, usually adjacent to a sea port.

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