in the first at first first of all都有首先的意思，它们有区别吗

Question

in the first at first first of all都有首先的意思，它们有区别吗？

Answer 1

first of all 表示“首先，第一”，相当于first。比如：
First of all, allow me to extend to you my warmest welcome.
首先，请允许我向你们表达我最热烈的欢迎。
First of all, you should hold an organizing committee meeting.
首先，我们应该召开一个组织委员会会议。

at first 表示“起初，起先，首先”的意思，比如：
At first, bartering took place as an exchange between two people.
起初，物物交换是发生在两个人之间的交易

in the beginning 表示“开始，开端，起初”，后面通常接介词of，比如：
In the beginning, the universe was a void full of energy but without form.
太初之际，整个宇宙一片混沌，只有能量。
In the beginning of the class, the teacher questioned us on verbs.
上课开始的时候，老师提问我们动词的用法。

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