Brownian motion
noun [ U ] physics specialized uk/ˌbraʊ.ni.ən ˈməʊ.ʃən/ us/ˌbraʊ.ni.ən ˈmoʊ.ʃən/ (also Brownian movement)
布朗运动
the movement of particles in a liquid or gas, caused by being hit by molecules of that liquid or gas
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