| 单词 | conversation tube |
| 释义 | > as lemmasconversation 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. < as lemmas |
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