To protect the ecological environment and to improve the efficiency of sewage and solid waste treatment system.

保护生态环境，完善污水和固体垃圾处理系统建设。

youdao

To protect the ecological environment and to improve the efficiency of sewage and solid waste treatment system.

保护生态环境，完善污水和固体垃圾处理系统建设。

youdao