firstly
01
首先, 第一
used to introduce the first fact, reason, step, etc.
例子
Firstly, gather all the necessary materials before starting the experiment.
首先，在开始实验之前收集所有必要的材料。
When setting up your profile, firstly, enter your basic information such as name and email address.
在设置您的个人资料时，首先，输入您的基本信息，如姓名和电子邮件地址。
