信号量对于系统的作用就像是十字路口的信号灯：一种保持系统运行顺畅的机制。
A semaphore is to your system what a traffic signal is to an intersection: a mechanism that keeps things running smoothly.
电压表应指示充电状态，红色信号灯指示高速充电器运行。
A voltmeter shall indicate the state of charge with a red pilot light to indicate when the high rate charger is in operation.
另外在轿厢内外均要有信号灯显示电梯运行方向及楼层数。
Also in the Cabin have both inside and outside lights show the direction of the lift and a few floors.
摘要：交通信号灯是城市交通安全、有序、快速运行的重要保障。
Abstract: The traffic lights are an important guarantee of city traffic safety, order and rapid running.
摘要：交通信号灯是城市交通安全、有序、快速运行的重要保障。
Abstract: The traffic lights are an important guarantee of city traffic safety, order and rapid running.
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