他们受雇于金属铸造厂和金属制品制造企业的代工部门。
They are employed by metal foundries and foundry departments of metal products manufacturing companies.
金属焊接和金属加工工艺的进步，对旧的金属铸造业产生了冲击。
Metal welding and metal processing technology advances, the old metal casting industry in the attacks.
金属焊接和金属加工工艺的进步，对旧的金属铸造业产生了冲击。
Metal welding and metal processing technology advances, the old metal casting industry in the attacks.
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