adj.(形容词)

1. 必需的，必不可少的，不可或缺的
2. 不能撇开的，不能省却的，省不了的
3. 责无旁贷的，不能推卸的，不能避免的
4. 重要的，主要的，必要的

n.(名词)

1. 必不可少的人
2. 不可缺少之物
3. 必需品

adj.(形容词)

1. 必不可少的,必需的 that cannot be dispensed with; absolutely essential

Adjective:

1. not to be dispensed with; essential;

   "foods indispensable to good nutrition"
   

2. absolutely necessary; vitally necessary;

   "essential tools and materials"
   "funds essential to the completion of the project"
   "an indispensable worker"
   

3. unavoidable;

   "the routine but indispensable ceremonies of state"
   

1.必不可少的;不可或缺的
If you say that someone or something isindispensable, you mean that they are absolutely essential and other people or things cannot function without them.

e.g. She was becomingindispensable to him.
他已变得越来越离不开她了。
e.g. ...theindispensable guide for any traveller in France.
在法国对任何游客来说都不可缺少的向导

1. 不可或缺：这时决定谁拥有游艇的所有权的关键因素在于1和2中谁拥有的专用型资产是不可或缺(indispensable)的或不可替代的. 意即,如果厨师是市场上独一无二的,而船长市场是竞争性的,那么游艇的所有权就应该由厨师拥有,反之反是.

用作定语～+ n.

1. This is an indispensable book.
   这是一本必不可少的书。
2. It is our indispensable duty.
   那是我们应尽的责任。

用作表语S+be+～

1. For a successful class humor is indispensable.
   要在课堂上取得成功,幽默是必不可少的。
2. For a successful leader ability is indispensable.
   对于一个成功的领导人来说能力是必不可少的。

S+be+～+ prep .-phrase

1. Books are indispensable to a scholar.
   书籍是学者必不可少的。
2. A balanced diet is indispensable for good health.
   均衡的饮食是健康所必需的。
3. A common element like oxygen is indispensable to living things.
   像氧这样的普通元素是生物所不可缺少的。
4. A good vocabulary is indispensable to anyone who wishes to be a good reader.
   任何人要想具有很强的阅读能力,都必须掌握大量的词汇。

• The citizens..had purchased an exemption from the indispensable duty of defending their country.

  出自：Gibbon

The computer is now an indispensable tool in many businesses.

目前计算机是很多公司不可或缺的用具。

Air is indispensable to life.

空气是生命所必需的东西。

A good dictionary is indispensable for learning a foreign language.

学习外语离不开好的词典。

Air, food and water are indispensable to life.

空气，食物，水皆为生命不可缺者。

Cars have become an indispensable part of our lives.

汽车已成了我们生活中必不可少的一部分。

She made herself indispensable to the department.

她成为这个部门不可缺少的一分子。

A good dictionary is indispensable for learning a foreign language.

一本好词典是学习外语必备的。

She was becoming indispensable to him.

他已变得越来越离不开她了。

...the indispensable guide for any traveller in France.

在法国对任何游客来说都不可缺少的向导

It is an output device, the computer will one of the indispensable components.

它是一个输出设备, 是电脑必不可缺少的部件之一.

Starch is indispensable to life.

淀粉对生命是不可或缺的.

Business leaders agree: the project management profession is indispensable for business results.

商业领袖们认为: 项目管理专业知识与商业运营结果密不可分.

Liquor blending , as an indispensable processing procedure, is of vital importance in liquor production.

白酒勾调技术工作非常重要, 是白酒生产中不可缺少的工艺环节.

Additional, the change of international situation also is an indispensable main factor.

另外, 国际形势的变化也是一个不可缺少的重要因素.

Water is indispensable to plants.

水是植物不可缺少的.

In modem manufacturer information system ( MIS ), printing is an indispensable part.

摘要打印是现代企业信息管理系统中的一个非常重要的功能.

The innovations of the media, materials and techniques are indispensable to the development of watercolour painting.

就形式而言,媒介 、 材料、技法等的变通和不断创新,是水彩画长久发展的必由之路.

The facility is an indispensable prerequisite for studying aerosol infection animal experimental.

气溶胶暴露设备是进行实验动物感染研究必不可少的条件.

Environmental biotechnology has become an indispensable component our current society and cleaning up the contaminated sites.

环境生物技术在社会的发展中起着越来越重要的积极作用,相关产业也随之迅速发展起来.

This is an indispensable part of his creed.

这是他的信条中必不可少的一部分.

Along with water and electricity, gas is an indispensable public utility.

和水及电一样, 气也是不可缺少的公共服务.

He involuntarily raised his hand to explain that yin and yang are mutually indispensable and engendering.

他下意识地举起手来解释阴与阳之间的相互依存.

The perfect legislation and strict execution of law are indispensable to crack down on the counterfeiting.

完善的立法与严格的执法,是打击假冒伪劣所不可或缺的.

The ability of capital flow is an indispensable condition to maintain steadfast management of capital.

资本流动能力是资本稳健经营的不可或缺的条件.

Trademark words as one indispensable element in commercial activities have received increasing attention.

作为商业活动中不可分割的要素,商标词受到越来越多的重视.

Therefore, organization, environment and leader are indispensable elements for Theme Identification.

由此, 组织 、 环境、领导成为主题辨识模式中不可或缺的三方面要素.

So, it is indispensable to investigate thoroughly the three dimensional viscous flow through the turbine.

为此, 对水轮机内部流动状况进行三维粘性流动数值解析是非常必要的.

Signalling System is one of the important and indispensable technologies in modern communication networks.

在现代通信网中,信令系统是必不可缺的的关键技术之一.

For a successful class humour is indispensable.

要在课堂上取得成功,幽默是必不可少的.

Dictionaries are indispensable in English study.

学英语,词典是少不得的.

These are indispensable accessories.

这些是不可缺少的附件.

This is an indispensable book.

这是一本必不可少的书.

He is indispensable to our work, we cannot do it without him.

对于我们的工作来说,他是不可缺少的,没有他, 我们就做不了.

Cars have become an indispensable part of our lives.

汽车已成了我们生活中必不可少的一部分。

indispensable，essential，necessary，requisite

这些形容词均有“必不可少的、必需的”之意。

indispensable语气强，侧重指绝对必要性或不可缺少性。

essential指对事物本身性质具有决定性的重要性，暗含不可缺少，否则便无法存在。

necessary最常用词，侧重由客观因素决定的某种需要，强调不可避免，但并非绝不可缺少。

requisite正式用词，特指为实现某一目的或得到某种结果而应有的需要，有时可与necessary换用。

• ☆ 1530年左右进入英语，直接源自中古拉丁语的indispensabilis，意为必不可少的。