树上

树上

"树上" means "on the tree."

In this sentence, "树上" refers to "on the tree", indicating the location where the birds are singing.

树上有几只鸟在唱歌。

There are several birds singing on the tree.

Here, "树上" means "on the tree", specifying the place where the decoration is hung.

有人在树上挂了一个装饰物。

Someone hung a decoration on the tree.

"树上" in this context describes "on the tree", focusing on the natural state or condition of elements (leaves) situated on the tree.

秋天到了，树上的叶子变成了金黄色。

Autumn has arrived, and the leaves on the tree have turned golden yellow.