At first和First at all 有什么区别？

First of all, I would like to thank all of you.
首先我要谢谢大家。
I would like to eat banana at first.我想先吃香蕉。
"First of all'比较正式，通常在正式场做开场白时说。

At first 起先,在陈述的时候用
<br>First of all 首先,在列举的时候用

first第一
at first起初
first of all 首先

first 数词 比如 这是我第一次做什么...用 first

at first 之前的事
比如 he didn't brush his teeth at first他起初没刷牙

first of all
你要做什么事有什么逻辑的话 一步一步来
首先先要怎样 用 first of all