流体动力学 liútǐdònglìxué fluid dynamics Origin Definitions Defs Strokes Stroke Words Sentences Sents 流体 流體 liútǐ noun fluid Any substance that flows and has no fixed shape, such as a liquid or a gas.动力学 動力學 dònglìxué dynamics the branch of mechanics or chemistry dealing with the motion of bodies and the effects of forces; dynamics or kinetics