fluid (noun / adjective)
流体是指没有固定形状且易于流动的物质，如液体或气体。
"The doctor told him to rest and drink plenty of fluids."
Think of a 'FL-ow' in a 'U-nit' of 'ID-entity'. FLUID. It flows, it's a unit of matter, and it describes identity.
He is fluid in German. → He is fluent in German.
The air is a liquid. → The air is a fluid.
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