单词 | colour light signalling |
释义 | Definition of colour light signalling in English:colour light signalling(US color light signaling) noun Railways
OriginEarly 20th century; earliest use found in Electric Railway Journal. Definition of colour light signalling in US English:colour light signalling(US color light signaling) noun Railways
OriginEarly 20th century; earliest use found in Electric Railway Journal. |
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