铜是植物生长发育必需的微量元素，但过量的铜对植物有毒害效应。
Copper is an essential micronutrient for plant metabolism, but it becomes extremely toxic when presenting in excessive amount.
本文介绍了烟气中有毒成分自由基的形成、性质及对人体的危害，并介绍了对植物添加剂降低清除烟气自由基的研究进展。
Not only the formation, characters and harmfulness were introduced, but also the removal of free radicals in cigarette smoke by plant additives was discussed in detail.
在过去，研究昆虫对植物防御的适应性方面始终关注的是化学反馈，也就是说昆虫如何中和或者改变植物产生的有毒物质。
In the past, scientists who studied insect adaptation to plant defenses have focused on chemical responses. That is, how the insects can neutralize or alter the poisonous substances plants produce.
铅甚至在低浓度下对植物有毒害作用，而且会对人的身体健康造成极大的危害。
Among them, the lead had toxic effects on plants and human health even at low concentrations.
铅甚至在低浓度下对植物有毒害作用，而且会对人的身体健康造成极大的危害。
Among them, the lead had toxic effects on plants and human health even at low concentrations.
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