2. Rice: usually refers to rice, also called rice. Wheat: refers to wheat, because it needs to be processed and ground into flour, so it can also be used to refer to flour. Millet: Also known as "millet" and "millet", in ancient times, it specifically referred to a panicum miliaceum whose seed was actually called millet. The seed was light yellow, and after peeling, it was called yellow rice, which was slightly larger than millet. Millet: an ancient food crop, which refers to millet or millet. Spike: the general term for beans.