1.  first
2.  in the first place
3.  firstly

• 1. 首先: first | above all | in the first place | first of all
• 2. 不首先使用核武器政策: the policy of no-first-use of nuclear weapons
• 3. 互不首先使用核武器条约: a treaty on no-first-use of nuclear weapons against one another

更多释义

• 1.你首先需要熟悉文件归档方法。
  You will first need to acquaint yourself with the filing system.
  dict.yoduao.com
• 2.首先我们必须找出问题所在。
  First of all we must identify the problem areas.
  dict.yoduao.com
• 3.首先我必须通过这些考试。
  First I have to get through the exams.
  dict.yoduao.com

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