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。
The material use efficiency of China is lower than that of developed countries, and compared to USA, Chinese ecological environment system have more pressure.
中国的物质利用效率低于发达国家，和美国相比，中国的生态环境系统承受了更大的压力。
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