They are employed by electrical contractors and maintenance departments of factories, plants, mines, shipyards and other industrial establishments.

他们受雇于电业承办商和工厂的维修工部门，工厂，矿山，船厂和其他工业场所。

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They are employed in boiler fabrication, manufacturing, shipbuilding, construction, electric power generation and similar industrial establishments.

他们受雇于锅炉制造，制造，造船，建筑，发电及类似的工业场所。

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Gas fitters install, inspect, repair and maintain gas lines and gas equipment such as meters, regulators and heating units in residential, commercial and industrial establishments.

燃气装配工安装，检查，维修和保养住宅，商业和工业机构的天然气管道和燃气设备，如仪表，稳压器和供热单位。

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The total heat and electric needs of the world can be successfully met by skillfully utilizing the rubbish human society generates each year in their homes and industrial and commercial establishments.

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