• 1. Signal System: 信号系统 | 信号制式
• 2. first signal system: 第一信号系统
• 3. second signal system: 第二信号系统

更多释义

• 1.The signal system on the railroad served as the basis for the first traffic light.
  铁路上的信号系统成为第一个交通信号灯的基础。
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• 2.It had been adapted from the railroad signal system by a railway manager, John Peak Knight, in 1868.
  它是由铁路经理约翰·皮克·奈特在1868年从铁路信号系统改造而来的。
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• 3.In a four-signal system that has a flashing yellow arrow, the steady yellow arrow is a signal that the yield period is ending. The red arrow is about to start.
  在具有闪烁黄色箭头灯的四信号系统中，稳定黄色箭头表示让行期即将结束。红色箭头灯即将出现。
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