essential nutrient element

基本解释

Cadmium is not an essential nutrient element for plants, but iron is the essential one.
镉是植物的非必需元素，而铁是植物生长发育过程中必不可少的元素。
Cadmium is one of the most toxic heavy metals and is not an essential nutrient element for plant, animal and human being.
镉是动物和植物的非必需元素，也是毒性最大的重金属之一。
Deficiency disease A disease caused by deficiency of a particular essential nutrient (such as a MICRONUTRIENT or trace element), usually with a characteristic set of symptoms.
由于缺乏一种特殊的必要营养物质（微量营养素或微量元素）而导致的疾病，通常表现出具有特征性的一系列症状。