The welding is mostly done by highly qualified welders.
这些焊逢几乎全由高水平的焊工完成。
Objective To investigate the status of health in the welders.
目的调查电焊工人的职业健康状况。
Investigate its reason, experts doubt and electric welders are concerned.
究其原因，专家怀疑与电焊工有关。
Investigate its reason, experts doubt and electric welders are concerned.
究其原因，专家怀疑与电焊工有关。
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