traffic light [ˈtræfɪk laɪt] n. 交通灯
英英解释（牛津词典）：
a signal that controls the traffic on a road, by means of red, orange and green lights that show when you must stop and when you can go
traffic light的特点：
控制道路上交通的信号灯（a signal that controls the traffic on a road）通过红色，橙色和绿色的灯（by means of red, orange and green lights ）告诉你什么时候该停下来，什么时候该走（ that show when you must stop and when you can go）单词选自：
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根据艾宾浩斯记忆原理，请复习单词：