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car signal
 car signal
tech. 机车信号
| valve
 valve
hydroel.st. 活门; 电子管; 真空管
racing 气门
space 排气阀; 通气阀门;
sport, bask. 球嘴
tech.

to phrases
car signal
tech. 机车信号
car signal valve
: 1 phrase in 1 subject
Rail transport1