essential/basic/central/chief/crucial/important/main.导航词义：主要的，重要的

1. essential:adj. 必要的，重要的，基本的.语气较强，强调极其重要、必不可少的，暗含某物如缺少某部分，则失去其本质特征的意味。

Water and food are essential to life.

水和食物对生命是必不可少的。

Her most essential quality is kindness.

她最重要的品质是善良。

2. basic:adj. 基本的，主要的.指构成事物最重要、最根本部分的。

the basic research/rule

基础研究/基本法规

He began to learn the basic principles of chemistry.

他开始学习基本化学原理。

The basic principles must be preserved.

这些基本原则必须保留。

3. central:adj. 重要的，主要的.强调相比较而言更重要或更有影响力的。

a central figure/idea/role

主要人物/中心观点/重要角色

She played a central role in the debate.

她在辩论中起到了重要作用。

4. chief:adj. 最重要的，主要的，首席的.强调最重要的或等级最高的，只作定语。

a chief engineer/judge

总工程师/审判长

The chief difficulty of this project lies in lack of funds.

这个项目的主要困难在于缺少资金。

5. crucial:adj. 决定性的，关键的.指处于某一重要转折点的，强调某事物非常重要，是其他事物依赖的对象。

This new policy is crucial to economic development.

这项新政策对经济发展至关重要。

The work of teachers is crucial in spreading knowledge.

教师的工作对知识的传播起着关键性的作用。

Their support was crucial to the project's success.

他们的支持对项目的成功至关重要。

Negotiations are now at a crucial stage.

目前，谈判正处于关键阶段。

6. important:adj. 重要的，重大的.普通用词，指人有权威、有影响力的，或指事物意义重大、有价值的。

She is obviously an important person.

她显然是个举足轻重的人。

It was one of the most important decisions ever made.

这是所作出的最重大的决定之一。

7. main:adj. 主要的，最重要的.普通用词，多指同类事物中最大、最重要的。

the main force/problem/road/street

主力军/主要问题/主干道/主要街道

She took down the main points of the speech.

她把演讲的要点记了下来。

Snails would, of course, be the main dish.

蜗牛当然会是道主菜。

全部

1·He likes to feel important.

他喜欢感到自己很重要。《牛津词典》

2·It is important not to skip meals.

重要的是，不能不吃饭。《柯林斯英汉双解大词典》

3·Now comes the really important bit.

现在到了非常重要的一小部分。《柯林斯英汉双解大词典》

4·They had important matters to discuss.

他们有些重要的问题要讨论。《牛津词典》

5·It's not important, he said blandly.

“这并不重要，”他平静地说。《柯林斯英汉双解大词典》

6·The important thing is to keep trying.

重要的是要不断尝试。《牛津词典》

7·I have something important to tell you.

我有重要的事情要告诉你。《牛津词典》

8·The latter point is the most important.

后面提及的那一点是最重要的。《牛津词典》

9·Let's get on to more important matters.

咱们谈些更重要的事吧。《柯林斯英汉双解大词典》

10·Chewing properly is crucially important.

正确地咀嚼是至关重要的。《柯林斯英汉双解大词典》

重要的

1·Now comes the really important bit.

现在到了非常重要的一小部分。《柯林斯英汉双解大词典》

2·It is important not to skip meals.

重要的是，不能不吃饭。《柯林斯英汉双解大词典》

3·It's not important, he said blandly.

“这并不重要，”他平静地说。《柯林斯英汉双解大词典》

4·They had important matters to discuss.

他们有些重要的问题要讨论。《牛津词典》

5·I have something important to tell you.

我有重要的事情要告诉你。《牛津词典》

重大

1·They discussed important issues in imitation of their elders.

他们模仿长辈的口气讨论重大问题。《柯林斯英汉双解大词典》

2·Researchers in this field have made some important new discoveries.

这个领域的研究人员有了一些重大的新发现。《牛津词典》

3·Good studies are needed to lend credence to the notion that genuine progress can be made in this important field.

要有优秀的研究才能使人相信在这一重大领域能取得真正的进步。《柯林斯英汉双解大词典》

4·There were many important events in this period.

这一时期发生了许多重大事件。

5·Reliance on trade had several important consequences.

对贸易的依赖产生了几个重大影响。

举足轻重的

1·The vice President of sales is one of the most important people within a company because this person is in charge of an organization's most critical assets: customers and the revenue they generate.

销售副总裁，可谓是一间公司最举足轻重的人物之一，因为他要面对的是公司业务最关键的部分：客户和利润。

2·Remember to use people's formal business titles - it helps to make them feel important.

记住要使用人们的正式商务头衔-这么做有助于让他们觉得他们举足轻重。

3·All eyes have been on the Salone, the world's biggest and most important furniture fair, held in Milan.

所有目光都聚焦在Salone，这个在米兰举行全球最具规模及举足轻重的家私展览。

4·The coal resource style city has the important part in industry economics in our country.

煤炭资源型城市在我国工业经济中起着举足轻重的作用。

5·Sheldon: I brought this on myself by being such an endearing and important part of your life.

谢尔顿：我自找的。谁叫我出现在你的生命中，那么讨人喜欢、那么举足轻重呢？

要紧

1·The most important thing a father can do for his children is loving their mother.

一位父亲能为他的孩子做的最要紧的事是爱他们的母亲。

2·But none of that matters, because the most important thing is relevance.

但那些都不要紧，最要紧的是内容让我们感兴趣。

3·Because the most important work is done away from a keyboard, software projects cannot be accelerated by spending more time in the office or adding more people to a project.

项目不可能通过程序员呆在办公室花更多的时间或者动用人海战术完成好，因为程序员最最要紧的工作往往是在他们撇开键盘时完成的。

4·The most important thing a father can do for his children is loving their mother。

一位父亲能为他的孩子做的最要紧的事是爱他们的母亲。

5·For us, for you and me, The only thing that is important: we are in love does not love.

对我们，对我和你，只有一件事要紧：那就是我们彼此还相爱不相爱。

(1)most important最重要的；首要的；最关键的

(1)more important更加重要

(1)play an important role起到重要作用

(1)vitally important极其重要的

(1)important event重大事件

(1)important news要闻