essential (EN)

形容词，名词

形容词 “essential”

1. 必要的
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   Drinking clean water is essential for good health.
2. 本质的
   Freedom of speech is an essential principle of democracy.
3. 精油的
   The essential oil from the lavender plant gives the soap its calming scent.
4. 必需的（生物学中指无法由身体合成，需从饮食中获取）
   Certain amino acids are essential because our bodies cannot produce them.
5. 特发性 (医学, 发生原因不明)
   The patient was diagnosed with essential tremor, which has no clear underlying cause.

名词 “essential”

1. 必需品
   Food and shelter are essentials for survival.
2. 基本要素
   The course teaches the essentials of computer programming.