要紧的英文：
important
urgent

参考例句：

1.essential; important; 2.to matter; to signify; to be critical; to be serious; to make a difference
要紧

Business before pleasure.
正事要紧。

Be honest rather clever
诚实比聪明更要紧

Theoretical study must be closely integrated with practice.
理论学习要紧密结合实际。

The most urgent thing to do right now is to break through the encirclement.
眼下最要紧的是突围。

Nothing is so necessary for travelers as languages
外出旅行,语言最要紧

To sum up the opening wedge was what counted.
总而言之，打开缺口是顶要紧的。

The speaker directed a side remark to the gallery
讲解员给观众讲了一句不太要紧的话。

Stay close behind me in the crowd.
在人群里你要紧紧地跟着我.

The thing is to know the nature of your antagonist
要紧的是要了解你的对手的特性。

important是什么意思：
a.
重要的，重大的；有权力的，有地位的，有影响力的

be of importance;matter
有重要性;有关系

He is an important official in the government.
他是政府的要员。

This is important to the development of dairy industry.
这对乳品业的发展很重要。

Christmas is an important feast for Christians.
圣诞节是基督徒的重要节日。

(degree of)importance,seriousness or influence
重要性、严重性或影响力（的程度）

urgent是什么意思：
adj. 紧急的；急迫的

The money was most urgently required.
钱要得很急。

Something urgent have come up.
发生了紧急的事情。

An urgent message was radioed to us this evening.
紧急消息是今晚用无线电传送给我们的。

Her voice was suddenly hard and urgent.
帕 梅 拉 的 声 音 忽 然 变 得 迫 切 而 生 硬 。

She was speaking to him in an urgent voice.
她正急迫地跟他说话。