essential

发音: US [ɪˈsenʃ(ə)l] UK [ɪ'senʃ(ə)l]

同义词

all-important critical imperative indispensable integral must-have necessary necessitous needed needful required requisite vital

adj.	1. 完全必要 2. 最基本、最必要的; 东西的本质特征是其最基本、最典型的特点; 关于你的身体需要为了保持身体健康的物质的使用
n.	1. 是所需的生活，或在某一特定情况中需要的东西 2. 一门学科最基本、最重要的方面

adj.	1. completely necessary 2. most basic and necessary; the essential features of something are its most basic and typical features; used about the substances that your body needs in order to stay healthy
n.	1. something that is needed for life, or needed in a particular situation 2. the most basic and important aspects of a subject