es·sen·tial

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【释义】：

a．❶ 本质的，实质的，基本的：essential elements(of sth．)(事物的)要素．There are no essential differences between imperialism and social-imperialism．帝国主义和社会帝国主义在本质上没有什么区别❷ 主要的，必要的：Building water irrigation projects is essential to(or for)the development of agriculture．兴修水利对于发展农业是必要的．The army is essential to consolidating the state power．军队是巩固政权必不可少的．❸ 精华的：essential oils【化】精油．essentially ad．

－n．本质，实质，要素，精华．