green light

n. 绿灯, 放行, 准许

例句与用法：

At night, ships at sea carry a red light on the port side and a green light on the starboard.

夜晚,海上的船亮起左舷的红灯和右舷的绿灯。

Before the traffic signal turns to green light don't cross the street.

在交通信号轮换到绿灯以前不要穿过马路。

The driver waited for the green light, his engine racing.

那司机等候绿灯放行，让发动机空转著。

详细释义：

ph.

1. 交通绿灯

2. 准许; 许可

3. 授权