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1·Water is a basic necessity of life.

水是一种基本生活必需品。《柯林斯英汉双解大词典》

2·There is agreement on the necessity of reforms.

关于改革的必要性有一致意见。《柯林斯英汉双解大词典》

3·We were discussing the necessity of employing more staff.

我们在讨论是否需要雇用更多员工。《牛津词典》

4·Air-conditioning is an absolute necessity in this climate.

这样的气候绝对需要有空调。《牛津词典》

5·There had never been any necessity for her to go out to work.

她从来就没有出去工作的必要。《牛津词典》

6·The population failed to understand the necessity for the war to go on.

人们没能理解那场战争继续下去的必要性。《柯林斯英汉双解大词典》

7·As soon as the necessity for action is over the troops must be withdrawn.

一旦军事行动的必要性不复存在，部队必须撤离。《柯林斯英汉双解大词典》

8·The violence of the revolutionary years was justifiable on the grounds of political necessity.

出于政治需要的立场，革命年代的暴力行为是无可非议的。《柯林斯英汉双解大词典》

9·It would be the first time in human history that economic necessity has prevailed over military aggrandizement.

经济需要压过了军事扩张，这将是人类有史以来的第一次。《柯林斯英汉双解大词典》

10·Travel has become a necessity.

旅行已经成为一种必需品。

必要性

1·There is agreement on the necessity of reforms.

关于改革的必要性有一致意见。《柯林斯英汉双解大词典》

2·As soon as the necessity for action is over the troops must be withdrawn.

一旦军事行动的必要性不复存在，部队必须撤离。《柯林斯英汉双解大词典》

3·This necessity comes with the rise of big science.

这种必要性是伴随着大科学的崛起而产生的。

4·The fund-raising ability is largely a product of experience and necessity.

筹集资金的能力在很大程度上是经验和必要性的产物。

5·As is shown in the picture, the pupils in the class are questioning the necessity of learning basic skill such as multiplication table.

如图所示，班上的学生正在质疑学习诸如乘法表等基本技能的必要性。

必要

1·There had never been any necessity for her to go out to work.

她从来就没有出去工作的必要。《牛津词典》

2·Obtaining good health insurance is a real necessity while you are studying overseas.

留学时，一份好的医疗保险是非常必要的。

3·Machine translation makes some parents raise doubts about the necessity for their children to learn foreign languages.

机器翻译使一些父母怀疑是否有必要让他们的孩子学习外语。

4·Andrew Schubert, a researcher at the institute for science policy research, says that the rising collaboration is partly out of necessity.

科学政策研究所的研究员安德鲁·舒伯特表示，这种日益增强的合作在一定程度上是必要的。

5·At the same time, people continue to treat fire as an event that needs to be wholly controlled and unleashed only out of necessity, says Professor Balch at the University of Colorado.

科罗拉多大学的鲍尔奇教授说，与此同时，人们一直把火当作一个需要完全控制且只有在必要的情况下才会让其释放的事件。

必然

1·This is, of necessity , a brief and incomplete account.

这必然是一份简略的、不完全的描述。《牛津词典》

2·The president pleaded that strong rule from the centre was a necessity.

总统争辩说来自中央的强有力的统治是一种必然。《柯林斯英汉双解大词典》

3·It's not that I'm proud of my scars - they are what they are, born of accident and necessity - but I'm not embarrassed by them, either.

我并非为自己的伤疤而自豪——他们不过就是疤痕，产生于意外和必然——不过我也不会因为有了它们而感到难堪。

4·For it is about our actions that we deliberate and inquire, and all our actions have a contingent character; hardly any of them are determined by necessity.

因为这与我们思考和调查的行为有关，而我们的所有行为都有着偶然性，它们就很难由必然所决定。

5·By thy first step awry, thou didst plant the germ of evil; but since that moment, it has all been a dark necessity.

由于第一步走歪了，你就种下了邪恶的胚胎；但自从那时起，它也就成了一种阴暗的必然。

需要

1·We were discussing the necessity of employing more staff.

我们在讨论是否需要雇用更多员工。《牛津词典》

2·Air-conditioning is an absolute necessity in this climate.

这样的气候绝对需要有空调。《牛津词典》

3·The violence of the revolutionary years was justifiable on the grounds of political necessity.

出于政治需要的立场，革命年代的暴力行为是无可非议的。《柯林斯英汉双解大词典》

4·It would be the first time in human history that economic necessity has prevailed over military aggrandizement.

经济需要压过了军事扩张，这将是人类有史以来的第一次。《柯林斯英汉双解大词典》

5·Sometimes convenience or practical necessity or just the fancy of an influential person can establish a fashion.

有时，某种便利或实际的需要，或仅仅是一个有影响力的人物的幻想就可以引领一种时尚。

必然性

1·The name of objectivity is here given to the element of universality and necessity, i.e. to the categories themselves, or what is called the a priori constituent.

这里所谓客观性是指那有普遍性和必然性的成分，亦即指思想范畴的本身或所谓先天的〔成分〕。

2·But, as he proceeded, a terrible fascination, a kind of fierce, though still calm, necessity seized the old man within its gripe, and never set him free again, until he had done all its bidding.

但在他着手进行这一调查的过程中，一种可怕的迷惑力，一种尽管依然平静、却是猛烈的必然性，却紧紧地将这老人攫在自己的掌握之中，而且在他未完成它的全部旨意之前。绝不肯将他放松。

3·The urgent necessity, a respected Washington columnist wrote the other day, is to make a decision-whether or not it is right.

“这种紧迫的必然性，”一个受人尊敬的华盛顿专栏作家有天写道：“就是去做一个决定，不管是正确还是错误的决定。”

4·THEREFORE: since these always carry a necessity with them, experience is only possible through a representation of necessary connection of perceptions.

既然这些概念在任何时候都带有必然性，所以经验就惟有通过知觉的必然结合的表象才是可能的。

5·Descartes nearly 'proves' the existence of God, by the fact that we are able to think about the necessity of his existence.

笛卡尔差点就“证明”了神的存在，基于该事实，使得我们能去思考存在的必然性。

必需品

1·Water is a basic necessity of life.

水是一种基本生活必需品。《柯林斯英汉双解大词典》

2·Travel has become a necessity.

旅行已经成为一种必需品。

3·If you are a manager of technology at any level, then this is your responsibility as well as a survival necessity.

如果您是某个层级技术的经理，那么这是您的职责，也是您赖以生存的必需品。

4·Congress alone can deal with them and if we are unwilling or unable there will soon be a trust for every product and a master to fix the price for every necessity of life.

国会可以独自应对它们，如果我们不愿或无法解决这个问题，那么很快每一种产品都会有托拉斯，每一种日常生活必需品都会有人来操纵定价。

5·Wires are an ugly necessity of the modern world.

导线是现代世界一个丑陋的必需品。

(1)of necessity必然地；不可避免地

(1)out of necessity出于需要，必定

(1)by necessity不得已；必然地，不可避免地

(1)logical necessity必然性，逻辑的必然性