| essential adj. 本质的, 实质的, 基本的, 提炼的, 精华的n. 本质, 实质, 要素, 要点 英英解释: 名词essential: 1. anything indispensable 同义词：necessity, requirement, requisite, necessary 形容词essential: 1. absolutely necessary; vitally necessary 同义词：indispensable 2. basic and fundamental 3. of the greatest importance 同义词：all-important, all important, crucial, of the essence 4. being or relating to or containing the essence of a plant etc 5. defining rights and duties as opposed to giving the rules by which rights and duties are established 同义词：substantive 6. absolutely required and not to be used up or sacrificed |