on the tree表示树上本身自有的东西,如:There are two apples on the tree.(树上结了两个苹果);in the tree表示外部的东西落在树上,如:There are two sparrows in the tree.(树上有两只麻雀)。

on the tree表示树上本身自有的东西,如:There are two apples on the tree.(树上结了两个苹果);in the tree表示外部的东西落在树上,如:There are two sparrows in the tree.(树上有两只麻雀)。