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地铁“红绿灯” / The subway "traffic light"


With the development of society, more and more people pay attention to the traffic congestion. For example, during the rush time, people is always busy in getting on bus in a hurry in some of China's large city with a dense population. But the train has its schedule, many people don't know when will close the door, which will cause accident.


Guangdong University of Techology

Guangdong University of Techology
Guangzhou City, China