Love for deep and complicated thinking can also be counted in the list.

爱的很深，想法错综复杂也是。

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Control how deep into your Page hierarchy the list goes.

控制列表中页面层次的深度。

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Return a deep copy of the list.

返回链表的深拷贝。

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Return a deep copy of the list.

复制这个链表并返回。

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Return a deep copy of the list.

复制这个链表并返回。

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