一个通用的体系结构策略就是把应用程序分层为不同的类类型。
A common architectural strategy is to layer your application into different class types.
由于市场不能发挥作用，因而大、中、小城市的分层城市体系结构就难以形成。
Market power could not play its role , thus city hierarchy could not be formed rationally.
由于市场不能发挥作用，因而大、中、小城市的分层城市体系结构就难以形成。
Market power could not play its role , thus city hierarchy could not be formed rationally.
应用推荐