石油和天然气钻井工人，服务人员，测试人员及有关人员。

Oil and gas well drillers, servicers, testers and related workers.

youdao

石油和天然气钻井工人，服务人员，测试人员及有关人员。

Oil and gas well drillers, servicers, testers and related workers.

youdao