3...provides convenience.. 你没有比较的对象,就不要用more了。
4. for one thing, ...后面这句话比较绕,需要重新组织一下
5. for another, these are shared bicycles. 主谓一致
6. we don't need to worry about +losing them.
7. In addition, using shared bicycles costs so little that most people can afford that. afford就是付得起的意思