化工工人
Chemical industry workers
Chemical plant workers
Employees of chemical factory
trace element
抗人工干扰
anti-artifical countermeasure
人工干燥
Artificial drying
artificial seasoning
articulated frame steering tractor
人工干燥积材法
Piling lumber for kiln drying
人工工作量模型
artificial work-load model
人工人口系统
artificial population systems