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chamber (n.)[chamber 词源字典]: c. 1200, "room," usually a private one, from Old French chambre "room, chamber, apartment," also used in combinations to form words for "latrine, privy" (11c.), from Late Latin camera "a chamber, room" (see camera). In anatomy from late 14c.; of machinery from 1769. Gunnery sense is from 1620s. Meaning "legislative body" is from c. 1400. Chamber music (1789) was that meant to be performed in private rooms instead of public halls.[chamber etymology, chamber origin, 英语词源]