In Shanghai，there're mainly four means of transportation,the underground，taxis, buses and electric bikes. The underground is much faster than taxis and buses. Buses are the cheapest but the slowest of the four. Taxis run quickly than buses, but they are expensive. Now, and people choose to use electric bikes. The electric bike is both clean and mobile. It also saves money. It is the most convenient means of transportation.
注释:
1) four means of transportation四种交通工具
2) choose to use electric bikes选择使用电动自行车
3) the most convenient means of transportation最便捷的交通工具
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