保护工人阶级利益  Protect the interests of the working class

工人阶级的  working-class

本阶人工内容  labor content this level

单级人工湿地  single stage constructed wetland

低阶人工内容  labor content lower levels

个人人工智能计算器  personal AI computer

工级人员  janitorial staff

化工工人  Chemical plant workers; trace element; Employees of chemical factory; Chemical industry workers

人工工作量模型  artificial work-load model

人工工作站  manual time; manual work station

人工级配骨料  artificially graded aggregate

人工阶梯－深潭  artificial step-pool

人工人口系统  artificial population systems

三级人工湿地  Three-stage Constructed Wetland

石油化工工人  Petrochemical worker

植人人工器官  Pollination

商人阶级  merchant class

（砌砖工人用来磨光砖石等的）磨（砖）石  Floatstone

[港口]装卸工人  stevedore