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In the begining , it will have many people near the downside of the escalator. At that time , the bird will fly very slowly between these cars ,and fly quickly at the end of cars , it can lead the people to the cars who are less people . Though this action, it can reach the balance of people .When both ends meet after a considerable number, birds will return . It can slove the problem of inbalance , also , it can enjoy the fun when you lining up in the MTR
Shih Chien University