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单词 brownian movement
释义 brown·ian movement
noun
or brownian motion \ˈbrau̇nēən-\
Usage: usually capitalized B
Etymology: after Robert Brown died 1858 Scottish botanist who discovered it
: the peculiar random movement exhibited by microscopic particles of both organic and inorganic substances when suspended in liquids or gases that is caused by the impact of the molecules of fluid surrounding the particles
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