Correct

在先

/ zàixiān /
Strokes

Definition

to come first/previous/prior/beforehand/first/formerly

Example

As an Adverb

formerly; before; in the past

1
Zàixiān
在先
nián
年纪
xiǎo
  
,
shénme
什么
shì
míngbái
明白
  

I was very young then and could hardly understand what was happening around me.

As an Adverb

beforehand; in advance

2
lùn
不论
zuò
shénme
什么
shì
  
,
zàixiān
在先
dōu
yào
yǒu
zhǔnbèi
准备
  

Whatever you do, be sure to get prepared in advance.