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、product

产品；制品

Try to get the best product at the lowest price.

尽量以最低的价格买到最好的产品。

South Korea's imports of consumer products jumped 33% in this year.

今年，韩国消费产品的进口激增了33%。

产物

We are all products of our time.

我们都是这个时代的产物。

The bank is the product of a 1971 merger of two Japanese banks.

这家银行是由两家日本银行于1971年合并而成。