Container一般既起到一个焦点遍历循环的成员的作用，也起到另一个焦点遍历循环的根的作用。

A Container generally functions as both a member of a focus traversal cycle and the root of another focus traversal cycle.

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Container一般既起到一个焦点遍历循环的成员的作用，也起到另一个焦点遍历循环的根的作用。

A Container generally functions as both a member of a focus traversal cycle and the root of another focus traversal cycle.

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