Function to find whether a tree is mono (all the elements are unique) or not?

函数找到一棵树是否是单声道(所有的元素是唯一的)或不？

youdao

Whether a tree falls to the south or to the north, in the place where it falls, there will it lie.

树若向南倒，或向北倒，树倒在何处，就存在何处。

youdao

If you find yourself needing to do this, consider whether a tree control or other element better suited to multiple-level hierarchies would be more appropriate.

如果你发现需要这样做，树状菜单或者其他的适合显示多级结构的元素可能更合适。

youdao

Thus, my question this morning is akin to the age old dilemma relating to whether or not a tree falling in the woods actually makes any sound if no one is there to hear it.

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