Definition: used to introduce the first idea, reason, etc., in a series Level: B1
首先，把面粉倒进碗里。然后，加入鸡蛋。
___First, put the flour into the bowl. Then, add the eggs.
首先，我要感谢我的父母。
___First, I want to thank my parents.
首先，我们都在琳达的咖啡馆见面，带上我们的自行车，然后我们开始了去德克萨斯的旅程。
___First, we all met at Linda's cafe and brought our bikes, then we started our trip to Texas.
