es.sen.tial
adj.(形容词)Constituting or being part of the essence of something; inherent.本质的:是物体必不可少的组成部分;固有的Basic or indispensable; necessary:基本的,必须的:基本的或不可缺少的;绝对必要的:例句:essential ingredients.See Synonyms at indispensable 必要的构成要素参见 indispensable
Medicine Of, relating to, or being a dysfunctional condition or a disease whose cause is unknown:【医学】 原发的:疾病或状态自发的,原发的或特发的:例句:essential hypertension.本态性高血压
Biochemistry Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet.【生物化学】 元素:人体某一功能所必需,又不能由身体合成的物质,必须由食物含这种物质n.(名词)Something fundamental.基本要素:基本必要的东西Something necessary or indispensable.必需品:某物要素或实质
【引伸】
essen.tial.ity
essen.tially
adv.(副词)