一个人在开车时注意交通号志是很重要的。
It's important to pay attention to the signal of the traffic light when one drives.
一般红绿灯是安置在人们视线高度的地方，但是都市规划者注意到人们常低头使用智慧型手机，因此将号志灯装设在地面上更为安全。
Although the lights are usually mounted at eye level, city planners noticed that people were using smartphones so much that it would be safer to install them in the ground.
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