部分患者有接触金属粉尘、特殊化学物质史。
Some of them had exposed to metal dusts and special chemical substance.
铣床上的电动机都是全封闭的，以防止金属粉尘进入。
Motors on the milling machines are totally enclosed to guard against ingress of metallic dust.
铸造间、打磨间、通风应良好，员工操作时应带防护口罩，防止金属粉尘给员工身体带来不利。
Good ventilation is required in the casting shop and sanding shop. Operators must wear protective gauze mask to prevent harm from metal powder to human body.
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