生苍粉尘作业危害程度分级的英文

classification of hazard levels due to exposure to industrial dust

• 生:    give birth to; bea ...
• 苍:    dark green
• 粉尘:    stive; dust
• 作业:    school assignment
• 危害程度:    extent of injury
• 分级:    grade; classify; c ...