signal system

• 信号制,信号系统,振铃制

signal system的用法和样例：

例句

1. So they had bypassed the warning signal.
   因此他们没有让警报信号系统起作用。
2. At the inquest, the accident was imputed to a mechanical failure of the signalling system.
   经调查，这次事故被归咎于信号系统中出现的一个机械故障。