For how long can we realistically expect to have oil? And which dwindling element is essential to plant growth?
石油末日何时到来？哪些对植物生长的有益元素正在急剧减少？
Assessing the remaining life of key components in high temperature service is an essential element of strategic plant maintenance and plant life extension programs.
高温服役关键构件的剩余寿命评价是制定工厂维修策略和延寿方案的基本环节。
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。
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。
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