Rice, grass, and millet.
1. Rice: Rice is an important food crop. It is one of the common nicknames in the "Book of Songs". For example, in "Xiaoya Cheha" there is "The substance of rice and the weaving of linen." "sentence.
2. He: He refers to all cereal crops, including rice, wheat, millet, etc. In the "Book of Songs", it is one of the other names for grain, such as in "Xiaoya Cheha" "Grain crops and wheat, weave flax and weave".
3. Millet: Millet is a kind of wheat, and it is also one of the common nicknames for grain in the "Book of Songs". For example, there is a sentence in "Xiaoya Cheha" that "millet is the best, and linen is the weave."