1. 形容詞
   必要的, 不可缺的
   必備的
   重要的, 精華的
   本質的, 實質的
   提煉的
   基本的
   essential to/for ...(人事物):
   對...是必不可少的
   對...是不可缺的
   對...是至關重要的
   

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   同義字詞
   all-important,critical,imperative,indispensable,integral,must-have,necessary,necessitous,needed,needful,required,requisite,vital
   basal,basic,beginning,elemental,elementary,fundamental,introductory,rudimentary,underlying
   built-in,constitutional,constitutive,hardwired,immanent,inborn,inbred,indigenous,ingrain,ingrained,engrained,inherent,innate,integral,intrinsic,native,natural
   

2. 名詞
   通常為複數essentials:
   必需品, 必要之物
   必要的東西
   基本要素, 要點
   本質, 實質
   a non-essential/
   non-essentials:
   非必需品
   an essential oil/
   essential oils:
   

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   同義字詞
   condition,demand,must,must-have,necessary,necessity,need,needful,requirement,requisite,sine qua non
   ABC(s),basics,elements,fundamentals,principles,rudiments
   

例句

1. It's essential on any used car.
2. Here's our guide to the most essential .
3. Iron is essential for proper body functions.
4. This essential sugar helps other tissues as well.
5. In sports, trust between teammates is essential .
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