there are many bird singing the tree问号处填什么借此或者副词

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there are many bird singing the tree问号处填什么借此或者副词

in the tree
在树上(外来物),指在树上站着.
on the tree不对.
在树上(原生物),指长在树上.

there are many birds singing in the tree

in the tree
长在树上的东西用on
形容某个东西在树上,用in