Water body quality of Xi'an city circumvallated river was monitored and evaluated in summer and winter by saprobien system and biotic indexes of pollution, combined with water quality analysis.
结合水质分析及污染生物指数，采用污化系统法对酉安护城河河水在冬夏两季进行了监测研究。
The enterprise cluster, which possesses some behavioral traits of the biotic community, is a social ecological system.
企业集群有着生物群落的行为特征，它本身就是一个社会生态系统。
Biotic immune system is a highly complex system of distribution and self-adaptation.
生物免疫系统是一个高度复杂的分布协调自适应系统。
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