Adverb:

1. before anything else;

   "first we must consider the garter snake"
   

1. 首先,第一：first and foremost 首要地,首先 |firstofall 首先,第一 |first or last (古)迟早,早晚

2. first of all的解释

2. 首先：26. not atall 一点也不; 不用谢 | 27.firstofall 首先 | 28.allow sb. to do sth.允许某人做某事

3. 首先,开始时：find out查明;找到;发现 |firstofall首先,开始时 | for ever永远

4. 首先;最重要的是：16. learn from 向......学习 | 17.firstofall 首先;最重要的是 | 18. throw away 扔掉

Athletes should first have the sense of fair play.

运动员首先要有公平竞争的意识。

I must finish my homework first.

我必须首先做完家庭作业。

first of all, answer these questions.

首先，回答这些问题。

first of all, you should know what profession suits you.

首先, 你该知道什么职业适合你.

first of all I must take these magazines to the teacher.

首先我得把这些杂志交给教师.

first of all we should make primary education universal.

首先我们应普及初等教育.

'first of all we'll try the book,'observed the doctor.

“ 我们先看看这个本子. ” 大夫说.

My aim was first of all to determine what I should do next.

我的目标首先是要确定自己下一步该做什么。

first of all, cascading menus are to be avoided at all costs.

首先, 无论如何都要避免使用级联菜单.

He first of all posted the letter to the archbishop.

他首先把写给主教的那封信寄了.

first of all, the agenda should be prepared before the meeting.

首先, 开会前要准备好议程.

Yes, but first of all, fetch me those Moore files right away.

是的, 但首先把摩尔的那些档案立即拿来.

We must first of all destroy the enemy's effectives.

我们首先必须消灭敌人的有生力量.

The first of all the negro minstrel shows came to town, and made a sensation.

一流的黑人演奏队来到了这个小镇, 引起了轰动.

first of all it raised water through 30 feet by utilising the pressure of the atmosphere.

首先,利用大气压将水抬高30英尺.

first of all there are the remarkable achievements of a molecular radio spectroscopy in these clouds.

首先应说到的是分子射电频谱学研究这些云所取得的显著成就.

But first of all, we must think of a way to distract the attention of Aileen.

首先, 我们必须想出个办法来转移爱玲的注意.