non-essential element

英 [ˈnəʊn ɪˈsenʃl ˈelɪmənt]

美 [ˈnoʊn ɪˈsenʃl ˈelɪmənt]

非必要元素

The object, which professed to be the essential reality, is now the non-essential element of sense-certainty;
那本来据说是本质的东西，现在却成为感性确定性中的非本质的东西；
Cd is non-essential element for humans and animals as well as plants, and is highly toxic to them.
Cd对于人体和动植物都是非必需元素，且有很强的毒性。
Cadmium ( Cd) is a non-essential trace element for plants, and has strong toxicity at low concentrations.
Cd是植物非必需的微量元素，对植物有很强的毒性。
At present, a large-scale used biomedical magnesium alloys mainly include AZ31 、 WE43 etc. However, the Al element may cause dialysis encephalopathy syndrome, alzheimer s disease and other degenerative neurological diseases, which is considered as a non-essential trace element of low toxicity.
目前大规模使用的生物医用材料镁合金有AZ31、WE43等。Al可能引起透析性脑病综合征、老年性痴呆等一些退行性神经疾病，被认为是一种非必需性的低毒微量元素。
Arsenic ( As) is a non-essential element for plant growth, with toxic, carcinogenic and mutagenic properties. Arsenic pollution problem has received close attention from the public.
砷是一种植物生长的非必需元素，具有剧毒、致畸和致突变效应，砷污染问题一直为人们所关注。