首先
firstly; （最先） first; in the first place; first of all; above all;
[例句]在任何时候任何情况下中国都不会首先使用核武器。
At no time and in no circumstances will China be the first to use nuclear weapons.
First;
Firstly;
In the first place;
都可以
--- first
---- At first
---- first of all....
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