求翻译：焊接铜、铝、铅、锌合金金属时，必须穿戴防护用品，在通风良好的地方作业。在有害介质场所进行焊接时，应采取防毒措施，必要时进行强制通风。是什么意思？

Welding copper, aluminum, lead, zinc alloy metal, must wear protective equipment, work in well-ventilated place. Place in the welding of harmful media, should take protective measures, if necessary, forced ventilation.

Weld copper, aluminum, lead, zinc alloy metal, must wear protective equipment, operating in a well ventilated area. In harmful media establishments in welding, anti-virus measures should be taken when necessary, forced ventilation.

When welding copper, aluminum, lead, zinc base alloy metal, must dress the protection thing, is ventilating the good place work.Carries on the welding when the harmful medium place, should take the anti-poison measure, when the necessity carries on the forced draft.

Welding of copper, aluminum, lead, zinc alloy metal when, must wear protective equipment, and jobs in a well-ventilated place. When the harmful media site for welding, anti-virus measures should be taken, if necessary, forced ventilation.

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