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at first 与 first of all 有什么区别?

题目详情
at first 与 first of all 有什么区别?
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答案和解析
at first是指“最初”,“最开始”,
例子at first I thought he was a good person,but later I found out he is a jerk.最初我以为他是个好人,后来我发现他是个混蛋.
first of all是指次序上的“首先”“第一”这个意思
例子:first of all,I want to thank you all for coming.首先,我要感谢各位的光临.
所以这两次表达是有区别的.