按你的要求写的,
接上Now,public bikes are provided for people in many cities in China．I think it's a good thing．
First of all,it's convenient for people to go out by bike．They can rent and return the bikes at any time．Secondly,as we know,there is heavy traffic when people go to school or work．If more people choose to ride bikes,there will be fewer cars and the streets won't be as crowded as they are now．The most important thing is that riding bikes can help protect environment,because there will be less pollution．I hope more and more people can ride bikes and live a low-carbon life．
