There are trees on the mountain, but there are branches on them (as we all know).

2. Original sentence:

There are trees on the mountain and branches on the wood. Do you know that you are happy?

There are trees on the mountain and branches on the tree (everyone knows), but I like you until you don't know.

3. Background:

There are trees on the mountain and branches on the wood. The Yue Song is an early poem in the history of China literature, which clearly praises the friendship between nobles and laborers.