It is well known that small alley, quadrangles living environment too, sewage crosscurrent, generally lived 18-20 households each hospital, we can see that people need a modern living environment.

• 众所周知，小胡同、四合院的居住环境太差了，污水横流等，每院一般住着18-20户居民，由此可见，人们是需要现代的居住环境的。