necessity

/nəˈsesəti/📚 3986 106 2四级六级考研托福
The necessity of something is the fact that it must happen or exist. 必要性

noun [抽象名词]必需品,必需的事物;必要,需要;必然性,不可避免的情况

here is agreement on the necessity of reforms.
关于改革的必要性有一致意见。

necessity 出现在下面的课文中
Lesson 16 The modern city
Lesson 31 The sculptor speaks
Lesson 33 Education
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