Definition: before doing anything else Level: A2
首先，让我们自我介绍一下。
___First ___of ___all, let's introduce ourselves.
首先，我需要收拾我的行李箱。
___First ___of ___all, I need to pack my suitcase.
首先，确保你带好了护照。
___First ___of ___all, make sure you have your passport.
