essential nutrient element

基本解釋

Cadmium is not an essential nutrient element for plants, but iron is the essential one.
鎘是植物的非必需元素，而鐵是植物生長發(fā)育過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.
鎘是動物和植物的非必需元素，也是毒性最大的重金屬之一。
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.
由于缺乏一種特殊的必要營養(yǎng)物質(zhì)（微量營養(yǎng)素或微量元素）而導致的疾病，通常表現(xiàn)出具有特征性的一系列癥狀。