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单词 signal apparatus
释义

> as lemmas

signal apparatus
signal apparatus n.
ΚΠ
1840 Times 26 Nov. 3/1 The pneumatic signal apparatus to be applied to the tunnels.
1937 Jrnl. Royal Aeronaut. Soc. 41 295 Sites..for threshold lighting and other signal apparatus required to assist the pilot.
2001 Evening Standard (Nexis) 28 Mar. 4 All Metropolitan line services were halted between Baker Street and Aldgate yesterday while signal apparatus was examined.
extracted from signaln.
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