形容词
中文翻译：必需的
同义词：
['indispensable', 'fundamental', 'quintessential']
例句：
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1. The essential ingredients for the recipe aresugar and flour.
食谱的基本成分是糖和面粉。
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2. The company's success islargely due to its essential services.
公司的成功很大程度上归功于其基本服务。
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3. Theessential difference between the twocultures lies in their respective traditions.
两种文化之间最基本的区别在于各自的传统。