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1. new four great inventions:high- speed trains,mobile payment,bike sharing and online shopping
2.travlling by Chinese high speed train from Beijing to Tianjin
3.use mobile payment to buy anything he wants.
4.Bike sharing
5.buy something
2.travlling by Chinese high speed train from Beijing to Tianjin
3.use mobile payment to buy anything he wants.
4.Bike sharing
5.buy something
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