化工工人
Chemical industry workers
Chemical plant workers
Employees of chemical factory
trace element
浅层人工地震
shallow artificial earthquake
shallow seismic
浅层人工地震探测
shallow artificial seismic prospecting
人工地层冻结
artificial ground freezing
artifical ground freezing
人工地层冻结法
artificial ground freezing
artificial ground freezing method
人工地磁异常
cultural magnetic anomalies
人工地力
artificial fertility of soil
人工地貌分类
Urban man-made landscape classification