secondary system meaning in English

二次系统
二回路系统
辅助系统

Sludge liquor is recirculated in the secondary system .
污泥水回流到二级处理系统。
Sludge liquor is recirculated in the secondary system to assure its purity before discharge .
该泥水回流到二级处理系统，以保证排放前的澄清度。
Prospects for secondary system development of sichuan power grid in
系统二次发展展望
Analysis of data storage for electrical secondary system
电力二次系统存储备份方案分析
Methods for analyzing multiply connected secondary systems
多点连接二次结构地震响应的研究方法

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