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1、demonstration
示威;示威游行（或集会）
Riot police broke up a demonstration by students.
防暴警察驱散了示威的学生。
mass demonstrations.
群众性示威
证明;论证;表明;说明
This is a clear demonstration of how technology has changed.
这清楚地表明了技术已有了怎样的进步。
This was a very practical demonstration of why the Army trained people to be disciplined.
这很实际地说明了为什么军队要将士兵训练得遵规守纪。
(特质的)显示;(情感的)表露
There's been no public demonstration of opposition to the President.
没有人对总统公开表示反对。
physical demonstrations of affection.
身体上的亲昵
2、essential
绝对必要的;必不可少的;基本的
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。
As they must also sprint over short distances, speed is essential.
由于他们也必须进行短跑，因此速度至关重要。
基本的;本质的；根本的
Most authorities agree that play is an essential part of a child's development.
大多数权威人士都同意，玩耍在孩子成长过程中起着非常重要的作用。
In this trial two essential elements must be proven: motive and opportunity.
在这次审讯中，必须证明两个基本因素：动机和时机。
（某学科的）基础，基本知识
the essentials of everyday life, such as eating and exercise.
饮食、锻炼等日常生活的要素
This has stripped the contest down to its essentials.
这就使比赛精简到最基本的环节。
