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1·Money is not essential to happiness.

金钱对于幸福并非必不可少。《牛津词典》

2·Experience is essential for this job.

对于这个工作，经验是非常重要的。《牛津词典》

3·Let's just recapitulate the essential points.

让我们只概述一下基本要点吧。《柯林斯英汉双解大词典》

4·Such measures are desirable, if not essential.

这些措施即使不是必要，也是可取的。《牛津词典》

5·Training in interpersonal skills is essential.

各种人际交往技巧的训练是非常必要的。《柯林斯英汉双解大词典》

6·It is essential to keep the two groups separate.

将这两组隔开是完全必要的。《牛津词典》

7·Speed is the essential ingredient of all athletics.

速度是所有体育运动的基本要素。《柯林斯英汉双解大词典》

8·It is essential to feel at ease with your therapist.

与治疗师在一起时，关键是放松心情。《柯林斯英汉双解大词典》

9·Integrating the kids with the community is essential.

使孩子们融入这个社区是非常必要的。《柯林斯英汉双解大词典》

10·A ceasefire is an essential precondition for negotiation.

停火是谈判的必要前提。《牛津词典》

基本的

1·Let's just recapitulate the essential points.

让我们只概述一下基本要点吧。《柯林斯英汉双解大词典》

2·Speed is the essential ingredient of all athletics.

速度是所有体育运动的基本要素。《柯林斯英汉双解大词典》

3·A firewall provides an essential security blanket for your computer network.

防火墙为计算机网络提供了基本安全保障。《牛津词典》

4·The bridge will remain closed until essential repair work has been carried out.

在基本修缮工作完成之前，这座桥暂时关闭。《牛津词典》

5·The ability to impart knowledge and command respect is the essential qualification for teachers.

传授知识并博得尊敬的能力对老师们来说是基本的条件。《柯林斯英汉双解大词典》

必要

1·Such measures are desirable, if not essential.

这些措施即使不是必要，也是可取的。《牛津词典》

2·Although not essential, some prior knowledge of statistics is desirable.

统计学的知识虽非必要，但最好是学过一点。《牛津词典》

3·We know fidelity is an essential principle of genetic transmission.

我们知道，准确性是基因传递中的一个必要原则。

4·It is essential that people understand the potential problems of cross-cultural communication.

人们有必要去了解跨文化交流中存在的潜在问题。

5·Careful preparation for the exam is essential.

认真准备考试十分必要。《牛津词典》

本质

1·Beauty of the soul is the essential beauty.

灵魂之美才是本质之美。

2·I wouldn't ever compromise on the essential, the ideas, or the themes.

我永远不会在本质、思想或主题上妥协。

3·No, I wouldn't ever compromise on the essential, the ideas or the themes.

不，我永远不会在本质、思想或主题上妥协。

4·Yet the essential difference is undeniable.

然而，本质的区别是不可否认的。

5·The operator norm of T is the essential supremum of h.

“ T ”的操作规范是“ h ”的本质上确界。

必不可少

1·Money is not essential to happiness.

金钱对于幸福并非必不可少。《牛津词典》

2·A rich and varied cultural life is essential for this couple.

丰富多彩的、多样化的文化生活对于这对夫妇而言是必不可少的。《柯林斯英汉双解大词典》

3·This capacity for increased expressiveness, in fact, was essential to the Romantic style that dominated 19th century music.

事实上，这种更高级别的表现力对于主导19世纪音乐的浪漫主义风格来说是必不可少的。

4·Perhaps struggle unfolds first, not at an economic or social level, but over the appropriation of air, essential to life itself.

也许首先展开的不是在经济或社会层面上的斗争，而是为占有对生命本身必不可少的空气而斗争。

5·Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.

氧气在细胞呼吸的新陈代谢过程中是必不可少的，它能使细胞有效地从有机食物中获取能量。

必需的

1·French and German were deemed essential.

法语和德语被认为是必需的。《柯林斯英汉双解大词典》

2·It's true that high-school coding classes aren't essential for learning computer science in college.

诚然，高中编程课对于在大学学习计算机科学来说并不是必需的。

3·Physical activity can improve blood flow to the brain, fueling memory, attention and creativity, which are essential to learning.

体育活动可以促进血液流向大脑，提高学习必需的记忆力、注意力和创造力。

4·She decided that she was going to try to just use cash for two weeks to make all of her essential purchases and see what that would do to her spending.

她决定尝试在两周内只用现金来进行所有必需的采购，看看这会对她的消费产生什么影响。

5·The ability of a species to compete and adapt to a gradually changing environment is not the only ability that is essential for survival.

一个物种竞争和适应逐渐变化的环境的能力并不是生存所必需的唯一能力。

根本的

1·The essential difference between Sara and me is in our attitude to money.

我与萨拉的根本区别在于我们对金钱的态度。《牛津词典》

2·What they could not do was question the essential correctness of his thesis.

他们所不能做的，就是质疑他文章的根本正确性。

3·Thus they passed the minutes, each well knowing that this was only waste of breath, the one essential being simply to wait.

他们就这样说了几分钟的话，每个人心里都知道，他们那番话是白费口舌，根本的办法只有耐心等待。

4·He noted that while freshwater is essential to humans and ecosystems, the rain is falling in all the wrong places, for all the wrong reasons.

他提到，淡水既是人类的根本也是生态系统的基础，但雨水正因所有错误的原因下到了错误的地方。

5·In a team, reliance on others is essential.

因为在团队内部，信赖即是根本。

必备

1·Through this article you will be provided with some essential information about the use of dietary supplements during pregnancy.

这篇文章为你提供一些在怀孕期间有关营养补充剂使用的必备的信息。

2·It forges persistence which is an essential trait required for achieving success.

它锻造毅力，而这是取得成功所需的一个必备特征。

3·Directing an actor in line delivery is an essential skill for playwrights and directors.

对于导演和剧作家来说，指导演员表达对白是一项必备的技巧。

4·So half of our space walk is in complete darkness. The helmet lights are essential at the work sight.

这样我们太空行走的一半时间是在完全无光线下进行的，我们头盔上的光就成了工作时必备的光源。

5·To sum up: the vision presentation is your essential calling card at the business level.

总结：愿景展示是你在业务层次上的一张必备名片。

实质的

1·They can perform essential tasks, lend you money, encourage you, work for you, help you deal with an emergency, serve as a sounding board for your ideas, even fill in for you for a couple of hours.

他们可以执行实质的任务，贷给你资金，鼓励你，为你工作，帮你处理应急事件，为你的想法做宣传，甚至有时可以做你几小时的替身。

2·There is no essential difference to the relations between China and Africa judging from the principles and spirit of China's African policy.

从这些原则和精神的大致轨迹来看，中国和非洲国家的关系实质是没有变化的。

3·Optimizing your brain's function is essential to being the best you can be, whether at work, in leisure, or in your relationships.

优化你的大脑机能实质就是成为最好的自己，无论在工作、休息或关系方面。

4·We excessively seeked the essential justice while ignoring the procedural one in the past.

以往我们在刑事侦查中过分追求实质正义而忽略了程序正义。

5·Life style is the behavior manner of person, its essential is the choice of life pattern and activity.

生活方式是人们的行为方式，其实质是人的生活格局与行动选择。

要素

1·First, a business-level analysis class is one that is essential to the business domain, without reference to implementation or technology constraints.

首先，一个业务级别的分析类是业务领域中的一个要素，与实现技术无关。

2·These are some of the simple, but essential, steps to maximize the results from your online promotional efforts..

以上这些虽很简单，但却是实现在线营销收益最大化的要素。

3·Opposition is essential to a true equilibrium of forces.

凡事都有正有反，正与反乃是平衡力量的要素。

4·It's disturbingly common for romance counselors to neglect to mention this essential romance ingredient, in spite of how terribly important it is.

对于浪漫顾问来说这是个普遍的要素忽视点，尽管它极其重要。

5·It seems to me that hardiness is the chief essential for success.

看来坚韧是成功的基本要素。

(1)essential oil香精油，精油

(1)essential condition必要条件

(1)essential hypertension原发性高血压；特发性高血压

(1)essential element必需元素

(1)essential component主要部件；主要成分

(1)essential difference本质区别