描写上海的公共交通英语作文

in shanghai, therere mainly four means of transportation,the underground, tais, buses and electric bikes. the underground is much faster than tais and buses. buses are the cheapest but the slowest of the four. tais run more quickly than buses, but they are more epensive. now, more and more 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.