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ADJ（形容词） Something that is essential is extremely important or absolutely necessary to a particular subject, situation, or activity. 至关重要的
It was absolutely essential to separate crops from the areas that animals used as pasture.
把庄稼与牲畜的放牧区分开至关重要。
N-COUNT（可数名词） The essentials are the things that are absolutely necessary for the situation you are in or for the task you are doing. 必需品
The apartment contained the basic essentials for bachelor life.
这套公寓配有单身生活的基本必需品。
ADJ（形容词） The essential aspects of something are its most basic or important aspects. 基本的; 重要的
Most authorities agree that play is an essential part of a child's development.
大多数权威人士认为玩耍是孩子成长的一个重要部分。
N-PLURAL（复数型名词） The essentials are the most important principles, ideas, or facts of a particular subject. 要素; 要点
...the essentials of everyday life, such as eating and exercise.
…饮食、运动等日常生活要素。