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单词 conversation tube
释义

> as lemmas

conversation tube
conversation tube n. a tube for enabling conversation to be carried on easily with deaf persons; a speaking-tube for communicating between different parts of a building.
ΘΚΠ
society > communication > indication > signalling > audible signalling > [noun] > speaking-tube
speaking-tube1833
telephone1849
conversation tube1890
blower1945
1890 Army & Navy Stores Catal. Mar. 580 Conversation Tubes..each 2s. 9d. to 10s. 6d.
extracted from conversationn.
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as lemmas
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更新时间:2024/12/22 23:28:26