1、definite

明確的;確定的

It's too soon to give a definite answer.

要給出一個明確的答復，現在還為時過早。

Her Royal Highness has definite views about most things.

女王陛下對大多數事情都有明確的觀點。

(證據或信息)確鑿的，確切的

We didn't have any definite proof.

我們沒有任何確實的證據。

If you have any definite news of my husband, please let me know.

如果有我丈夫的確切消息，請一定告訴我。

清楚的;明顯的;無疑的

There has already been a definite improvement.

已經有了顯著的改進。

That's a very definite possibility.

那是很有可能的。

2、essential

絕對必要的;必不可少的;基本的

It was absolutely essential to separate crops from the areas that animals used as pasture.

將莊稼和放牧區分開絕對必要。

As they must also sprint over short distances, speed is essential.

由于他們也必須進行短跑，因此速度至關重要。

基本的;本質的；根本的

Most authorities agree that play is an essential part of a child's development.

大多數權威人士都同意，玩耍在孩子成長過程中起著非常重要的作用。

In this trial two essential elements must be proven: motive and opportunity.

在這次審訊中，必須證明兩個基本因素：動機和時機。

（某學科的）基礎，基本知識

the essentials of everyday life, such as eating and exercise.

飲食、鍛煉等日常生活的要素

This has stripped the contest down to its essentials.

這就使比賽精簡到最基本的環節。