【介绍】

等红灯

wait for the red light to change

stop at a red light

等红灯（变绿色再通行）

Wait for the red light to change and then you’re safe to go.
等下红灯变绿之后，你就可以安全通过了。

flash v. 闪烁

When the yellow light is flashing, the red light is about to appear.
当黄灯闪烁时，马上就要变红灯...