before you can say knife

例句：

1. 1.I will not go to the party before you arrive.
   在你到达之前我不会去参加聚会。
2. 2.Before you can say knife, he has already left.
   你还没来得及说刀，他已经离开了。
3. 3. Before we start, let's make sure everything is in order.
   在我们开始之前，让我们确保一切都井然有序。