1
it is essential (that) + clause
that可以省略。
It is essential that you arrive on time.
你必须准时到达，这是绝对必要的。
必要的；非常重要的；必不可少的
先理解核心含义，再看它在真实句子里的用法。
必要的；非常重要的；必不可少的
Extremely important and necessary.
It is essential that you arrive on time.
你必须准时到达，这是绝对必要的。
必需的
Necessary.
非常重要的
Very important; of high importance.
绝对必要的；极其重要的
absolutely necessary; vitally necessary
生存必需但无法自体合成,需摄入的
Necessary for survival but not synthesized by the organism, thus needing to be ingested.
Water is essential for human survival.
水对于人类生存是绝对必要的。
AI contextual example
It is essential that you arrive on time for the interview.
你准时到达面试现场是极其重要的。
AI contextual example
Good communication skills are essential in this job.
良好的沟通技巧在这份工作中是不可或缺的。
AI contextual example
essential tools and materials
必要的工具和材料
WordNet
that可以省略。
It is essential that you arrive on time.
你必须准时到达，这是绝对必要的。
Water is essential for life.
水对生命至关重要。
We need to focus on essential tasks.
我们需要专注于基本任务。
Not this
It is essential that he finishes his homework on time.
Use this
It is essential that he finish his homework on time.
在形容词essential后面的that从句中，美式英语要求使用虚拟语气，即动词用原形（finish），而不是第三人称单数形式（finishes）。
Not this
It is essential to you to practice every day.
Use this
It is essential for you to practice every day.
当essential后接表示“对某人来说”时，应用介词for（for you），而不用to；to通常后接名词或动名词表示目的，如essential to success。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
对…绝对必要
Water is essential for life.
水对生命是绝对必要的。
对…至关重要
Good communication is essential to a healthy relationship.
良好的沟通对健康的关系至关重要。
重要组成部分
Regular exercise is an essential part of a healthy lifestyle.
定期锻炼是健康生活方式的重要组成部分。
关键作用
Education plays an essential role in personal development.
教育在个人发展中起着关键作用。
基本服务
During the pandemic, essential services like healthcare remained open.
疫情期间，医疗保健等基本服务保持开放。
精油
Lavender essential oil is often used for relaxation.
薰衣草精油常用于放松身心。
必读材料
This book is essential reading for anyone interested in history.
这本书是对历史感兴趣的人的必读材料。
对…至关重要
Water is essential to life.
水对生命至关重要。
精油
She uses essential oils for aromatherapy.
她用精油进行芳香疗法。
Use essential naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 essence（本质），essential 即“本质的”，本质的东西当然是“绝对必要的”。
register: neutral; typical contexts: general conversation, formal writing, instructional materials; note: 通常表示绝对必要，语气中性，适用于多数场合
All listed words share the ending /ʃəl/ but have different stressed vowels, so they do not rhyme with essential (/ɪˈsɛn.ʃəl/).
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.