形容词
中文翻译：必需的
同义词：
['indispensable', 'fundamental', 'essential']
例句：
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1.The essential oil is used in many household products.
这种精油被广泛用于许多家庭用品中。
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2.The essential elements of the recipe are sugar, salt, and water.
食谱的基本成分是糖、盐和水。
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3.The essential difference between the two species is their size.
这两种物种之间最基本的区别在于它们的体型。