副词第一，首先（主要用于列举条目、论点时）

副词lastly

2. firstly的解释

副词

1. Firstly, let us deal with the most important issue.
首先让我们来处理最紧要的问题。

1. 首先：firstling 初生物 | firstly 首先 | firstname 名

2. 原因一：It will cause many serious results if . 问题产生的原因 | Firstly, . 原因一 | Secondly, . 原因二

3. 第一：At first 最初 | Firstly 第一 | at the very beginning 起初

4. 解决方法一：5. However, we have figured out many ways to . 提出解决这一问题的方法 | 6. Firstly, . 解决方法一 | 7. So long as . 进一步说明方法一

1. 首先;第一
You use firstly in speech or writing when you want to give a reason, make a point, or mention an item that will be followed by others connected with it.

e.g. The programme is now seven years behind schedule as a result, firstly of increased costs, then of technical problems...
该项目现已经比预定时间晚了7年，原因首先是因为成本增加，其次是由于技术问题。
e.g. Vitamin C has many roles to play in weight control. Firstly, it is needed for hormone production.
维生素C在控制体重方面扮演着多重角色。首先，荷尔蒙的生成有赖于它。

adv

1. before anything else

e.g. first we must consider the garter snake

Synonym: firstforemostfirst of allfirst off