考试热门词汇：
essential [??sen?l]
adj.
完全必要的;必不可少的;极其重要的;本质的;基本的;根本的，
n.
必不可少的东西;必需品;要点;要素;实质
复数： essentials
the essentials of English grammar
英语语法基础
1. It is(was或其他形式)essential（that）……最基本的是，至关重要的是，关键是，应该，完全必要的；必不可少的；极其重要的
It is essential that we present a united front.
至关重要的是我们要表现得团结一致。
It is essential that you are able to read a thermometer.
最基本的是要能看懂温度计。
It is essential that your diet is varied and balanced
关键是你的饮食要多样化，并保持均衡。
It is essential that we tackle this thorny problem.
我们很有必要处理这个棘手问题。
If you are prosecuted by the police, then it is essential that you take specialist legal advice.
如果你受到警方起诉，至关重要的是你要听取专业律师的意见。
It is essential that we should protect the environment.
我们应该保护环境，这至关重要。
It is essential that a student should know something about a computer.
大学生了解一些有关计算机知识是至关重要的。
It's essential that every child has an equal educational opportunity.
每个孩子都应有同等的受教育机会，这是很必要的。
It is essential that you have some experience.
你必须得有些经验。
It's essential you make the right decisions from the word go.
关键是从一开始就作出正确的决定。
《柯林斯高阶英汉双解学习词典》
2.It is(was或其他形式)essential to do sth
最基本的是，至关重要的是，关键是，应该，完全必要的；完全必要的；必不可少的；极其重要的，
It is essential to keep the two groups separate.
将这两组隔开是完全必要的。
It was absolutely essential to separate crops from the areas that animals used as pasture.
将庄稼和放牧区分开绝对必要。
It will be essential to establish how the money is being spent
查清楚这笔钱将作何用途至关重要。
《柯林斯高阶英汉双解学习词典》
It's essential to know which is which as treatments will be quite different.
由于治疗的方法将会全然不同，因此弄清楚哪个是哪个很重要。
《柯林斯高阶英汉双解学习词典》
It is essential to feel at ease with your therapist
在治疗师面前放松下来是很重要的。
It is essential to build up the military option and show that this is not a bluff
关键是要做好采取军事行动的准备，以表明这不是虚张声势。
3.sth is essential to /for
关键是，应该，必须，完全必要的；必不可少的；极其重要的
Money is not essential to happiness.
金钱对于幸福并非必不可少。
The agreement is essential to spurring economic growth around the world.
这项协议对于促进世界经济的增长是至关重要的。
spur [sp??r]
n.
马刺;靴刺;鞭策;激励;刺激;鼓舞;山嘴;尖坡;支脉
v.
鞭策;激励;刺激;鼓舞;促进，加速，刺激(某事发生);策(马)前进;(尤指用马刺)策(马)加速
Water and food are essential to life.
水和食物对生命是必不可少的。
Cooperative activity is essential to effective community work.
要把社区工作做好，协作活动是必不可少的。
Agriculture is essential to a nation.
农业对一个国家非常重要。
Elections are essential for the sustenance of parliamentary democracy.
选举制度是维持议会民主所必不可少的。
The possession of a passport is essential for foreign travel.
出国旅行必须持有护照。
A rich and varied cultural life is essential for this couple.
丰富多样的文化生活对这对夫妇而言至关重要。
Experience is essential for this job.
对于这个工作，经验是非常重要的。
Breathable, waterproof clothing is essential for most outdoor sports.
大多数户外运动衣服必须透气且防水。
Tidiness in the workshop is really essential for producing good work
工作间干净整洁对于生产出好的产品非常重要。
Polyunsaturated oils are essential for health. Excess is harmful, however.
多不饱和油对健康很重要。但是，食用过量就会有害。
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，从而增强记忆力、注意力和创造力，这些对学习来说都是不可或缺的。
四级真题- 2016年 6月 1卷 短文填空
Darkness is as essential to our biological welfare, to our internal clockwork, as light itself.
类似于光线，黑暗对我们的生理健康、生物钟具有关键作用。高考真题- 2015 浙江 阅读C
The essential place to visit, however, was Italy.
不过，必不可少的游历地点是意大利。
六级真题- 2017年 6月 3卷 阅读B