There was rice in ancient times, but there were no machines. What do they use to cover rice?

The "rice mill" and "threshing machine" created by ancient laborers gradually withdrew from the stage of life. ...

Li Si/Hebei Hejian millet, that is, millet, together with rice, wheat, beans and millet, is called five grains. When eating the seeds of these crops, it is natural to peel them first. This peeling process is called "mashing".

"Or mashed or elm, or raised or other." This sentence in the poem "Dazhi Sheng Min" gives us a vivid drawing of ancient rice. In the past, there were many ways to pound rice. One method is to drill a hole with a square stone, mash it with a mortar, and then beat it with a wooden pestle. One is to make a bed, which is roughly to dig the ground and put a stone mortar, put wooden poles on it, put pestles or tied stones on both ends of the wooden poles, move the wooden poles with your feet to lift the pestles, remove chaff, or pound them into powder. Later, he invented a cymbal bed that can generate power. Huan Tan's "New Theory" calls it a cymbal bed which is "skillful" by using the pestle principle. "practicing cymbals has ten times the benefits of delaying power." The author hides a pair of "Jojo" cymbal beds and rice-shaped pottery figurines.

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