Ammonia is a poisonous and harmful substance that should be recovered during equipment maintenance so as to avoid it leaks out to pollute environment and hurt human.
氨是一种有毒有害物质，在石化装置设备进行检修时需要对氨进行回收，否则容易造成环境污染和人体伤害及人员中毒事故的发生。
But at present, the solvents in the plastic gravure printing ink which in common use are the poisonous benzene solvents, that are harmful to environment and operator's health.
但是目前常用的塑料凹印油墨中使用的溶剂为有毒的苯类溶剂，它对环境及使用人员的身体健康带来了危害。
But at present, the solvents in the plastic gravure printing ink which in common use are the poisonous benzene solvents, that are harmful to environment and operator's health.
但是目前常用的塑料凹印油墨中使用的溶剂为有毒的苯类溶剂，它对环境及使用人员的身体健康带来了危害。
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