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。
Zinc is an essential nutrient element for biological organisms, but it is toxic to plant, animal and human at excess levels.
锌是生物必需微量元素，但过多时对动植物都有毒害。
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。
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。
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