1、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。

2、control

(对机构、地方、体系等的)控制权，支配权

The restructuring involves Mr Ronson giving up control of the company.

这次改组涉及龙森先生放弃对公司的控制权。

The first aim of his government would be to establish control over the republic's territory.

他这届政府的首要目标是确立对共和国领土的控制权。

控制(能力);支配(能力)

He lost control of his car.

他的汽车失控了。

Some teachers have more control over pupils than their parents have.

有的老师比小学生的父母更能管得住他们。

控制;掌管;管理;统治

He now controls the largest retail development empire in southern California.

他现在掌管着加州南部最大的零售发展企业。

Almost all of the countries in Latin America were controlled by dictators.

当时几乎所有的拉丁美洲国家都由独裁者统治。