我应该在红灯时、绿灯时还是黄灯时减速呢？
Should I slow down at a red light, a green light, or a yellow light?
正当他下坡的时候，他看到一堆又大又黑的黑云上系了一个红灯和一个绿灯，正在路上走着。
As he was descending, he saw a red light and then a green light attached to the back of a large black cloud moving down the road.
消费者把药片放到机器前，看到红灯亮，或绿灯亮。
You put your tablet in front of a machine and you get a red light or a green light.
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