At 9:30 am, the full red/yellow/green signal cycle might be 140 seconds.
上午九点半的时候，完整的红黄绿信号灯变换周期大概为140秒。
Outside his boardroom he posted red and green lights to signal to his secretary whether visitors could enter.
他在会议室的外面用红光和绿光来暗示秘书是否该让来访者进来。
For them, the red and yellow signal is an indication to crawl the car and keep moving, while the green signal is to zoom past all the other cars.
对于他们而言，红灯和黄灯意味着要慢慢溜过去，而非停下来，绿灯则是要加大油门甩掉其它的车辆。
Thus, green became "go," and for a long time, railways used only green and red to signal trains.
因此，绿灯成为了“通行”的标志，长期以来铁路也只将红色和绿色作为信号灯。
The signal values are standard, meaning green, yellow, and red light.
信号值是标准，这意味着绿色，黄色和红色光。
Boom fluctuation signal control system of retail commerce monitors and regulates the boom process of retail commerce by using a group of red, yellow and green lamps.
零售商业景气波动的信号控制系统，通过一组指示灯信号系统来监测、调控零售商业景气运行的过程。
Boom fluctuation signal control system of retail commerce monitors and regulates the boom process of retail commerce by using a group of red, yellow and green lamps.
零售商业景气波动的信号控制系统，通过一组指示灯信号系统来监测、调控零售商业景气运行的过程。
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