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critical element
anim.husb.	必需矿物质为动、植物生长和发育所必需的矿物元素
desert.	关键要素; 主要要素
met.	中肯元件; 临界元件
English thesaurus
critical element
USA	An element of an entity or object that enables it to perform its primary function; An element of a target, which if effectively engaged, will serve to support the achievement of an operational objective and/or mission task (JP 3-60)

critical element: 4 phrases in 2 subjects

Economy	1
Technology	3