essence

本質、實質、精髓

The essence of good teaching is knowing when to stay quiet.

好的教學，本質上在於知道何時該保持沉默。

精華、萃取液、香精

Add a few drops of vanilla essence to the batter.

在麵糊裡加幾滴香草精。

要素、核心

Speed is the essence of this kind of negotiation.

速度是這類談判的核心要素。

基本上、本質上

In essence, both proposals are asking for the same thing.

基本上，這兩份提案要的是同一件事。

刻不容緩、至關重要用於 of the essence

Time is of the essence, so please reply today.

時間緊迫，請今天就回覆。