substitute worker
... substitute gun 枪替; 枪替 substitute product 替代产品; 替代产品 substitute worker 替工 ...
replacement worker
... replacement worker 替工 rescue (operation, workers) 救难; 救难 rescue worker 救护人员; 救护人员 ...
Alternating process
alternation
替工(tì gōng)代替别人做工的人。