First of all等于哪三个单词的短语?

First of all等于哪三个单词的短语?
First of all等于哪三个单词的短语?

First of all等于哪三个单词的短语?
就是First,首先.

有道词典

First of all等于哪三个单词的短语？
= At first，
=at the beginning of

at the first