单词	Foucault pendulum
释义	Foucault pendulum noun Fou·​cault pendulum ˌfü-ˈkō-  : a freely swinging pendulum that consists of a heavy weight hung by a long wire and that swings in a constant direction which appears to change showing that the earth rotates Word History Etymology J. B. L. Foucault First Known Use 1931, in the meaning defined above
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