Environmental quality evaluation system consists of many subsystems. It is a complex and multilevel system.

环境质量评价系统是由许多子系统组成的结构复杂、变量众多的多级递阶系统。

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Environmental quality evaluation system consists of many subsystems. It is a complex and multilevel system.

环境质量评价系统是由许多子系统组成的结构复杂、变量众多的多级递阶系统。

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