How to guess the word du in the poem?

The five elements are hard to find gold, water and fire: the five acts are fire, water and earth, and gold, water and fire are hard to find, that is, as long as wood and earth are combined into Du characters.

The solitary tree has nowhere to stand by and watch the altar: the solitary tree is a wooden character, and the altar edge can be described by earth or cloud, while wood+cloud is not a character, only wood+earth is a Adu character.

There are eleven more trees on the edge of the forest: the edge of the forest is wood, and the eleventh is earth, which is the word du.

Fortunately, half a forest meets: half a forest is wood, half a forest is earth, and it is the word Du.

You can create a lot by yourself according to this idea.