There is a little bird in the tree.There are many pears on the tree.都是在树上为什么一个用in一个用on?

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There is a little bird in the tree.There are many pears on the tree.都是在树上为什么一个用in一个用on?
There is a little bird in the tree.There are many pears on the tree.都是在树上为什么一个用in一个用on?

There is a little bird in the tree.There are many pears on the tree.都是在树上为什么一个用in一个用on?
in the tree 和on the tree 都是在树上
in the tree 是不是树上结的东西 There is a little bird in the tree.
on the tree 是树上结的 There are many pears on the tree.
总结:外来物用in,果实、叶子用on.