1
necessity of (doing) sth
后接名词或动名词，表示某事的必要性。
We discussed the necessity of reducing costs.
我们讨论了降低成本的必要性。
必需品；必要的东西
先理解核心含义，再看它在真实句子里的用法。
必需品；必要的东西
something that you must have or need, especially for daily life
We discussed the necessity of reducing costs.
我们讨论了降低成本的必要性。
必要性；不可避免或绝对必需的品质或状态。
The quality or state of being necessary, unavoidable, or absolutely requisite.
必不可少的状态；必要性
the condition of being essential or indispensable
贫困的状态；极度需要；缺乏。
The condition of being needy; desperate need; lack.
必需的事物
anything indispensable
Food and water are basic necessities for survival.
食物和水是生存的基本必需品。
AI contextual example
When camping, you should pack all the necessities like a tent and sleeping bag.
露营时，你应该打包所有必需品，比如帐篷和睡袋。
AI contextual example
The store sells household necessities at affordable prices.
这家商店以实惠的价格出售家庭必需品。
AI contextual example
food and shelter are necessities of life
食物和住所是生活的必需品
WordNet
后接名词或动名词，表示某事的必要性。
We discussed the necessity of reducing costs.
我们讨论了降低成本的必要性。
表示对某物的需求或必要性，后接名词。
There is a clear necessity for renewable energy.
对可再生能源有明确的必要性。
后接不定式，表示做某事的必要性。
He felt the necessity to apologize.
他觉得有必要道歉。
否定形式，表示没有必要做某事。
There is no necessity to rush.
没有必要匆忙。
Not this
Water is necessity for life.
Use this
Water is a necessity for life.
necessity 是可数名词，前面需要加冠词 a 或 an。
Not this
It is necessity to finish the work.
Use this
It is necessary to finish the work.
形容词 necessary 用于 'It is + 形容词 + 不定式' 结构，而名词 necessity 需用 'There is a necessity to do' 结构。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
绝对必需品；绝对必要
Food and water are an absolute necessity for survival.
食物和水是生存的绝对必需品。
基本必需品
Access to clean water is a basic necessity for everyone.
获得清洁的水是每个人的基本必需品。
日常必需品
Toothpaste and soap are daily necessities in modern life.
牙膏和肥皂是现代生活中的日常必需品。
至关重要的必需品
Education is a vital necessity for a prosperous society.
教育是繁荣社会至关重要的必需品。
经济上的必要性
Many people work two jobs out of economic necessity.
许多人出于经济上的必要性而打两份工。
生活必需品
The refugees lacked even the bare necessities of life.
难民们甚至连基本的生活必需品都没有。
需要是发明之母
The lack of public transport meant they had to walk, and necessity is the mother of invention — they started a carpool.
公共交通的缺乏意味着他们不得不步行，而需要是发明之母——他们开始了拼车。
出于必要
She learned to cook out of necessity when she moved out on her own.
她独自搬出去住后，出于必要学会了做饭。
不得已
By necessity, the meeting was held online due to the storm.
由于暴风雨，会议不得已在线举行。
需要是发明之母。
This proverb, often attributed to Plato, highlights how challenges drive creativity. It appears widely in literature and everyday speech.
这句通常归功于柏拉图的谚语强调了挑战如何驱动创造力，广泛出现在文学和日常对话中。
需要面前无法律。
A Latin proverb meaning that extreme need can justify actions normally considered illegal or unethical, referenced in legal and political discussions.
一句拉丁谚语，意为极端需要可以证明通常被视为非法或不道德的行为是正当的，常出现在法律和政治讨论中。
Use necessity naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象沙漠旅行者，水是必需品（necessity）。
mixed: general discourse, formal writing, everyday speech; 通常用于正式或学术语境，也常见于日常对话中表示必需品。注：中性偏正式，多用于书面或严肃场合。
作'必需品'解时为可数名词，作'必要性'解时通常为不可数名词
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.