Correct

那阵儿

/ nàzhènr / 
Strokes

Example

As a Pronoun

at that time/moment; then; during that period of time; in those years

1
Nà
那
zhènr  
阵儿
rìzi
日子
kǔ
苦
ā
啊
  
!

Life was so hard in those days.

2
Nà
那
zhènr  
阵儿
wǒ
我
zhèngzài
正在
shuìjiào
睡觉
  
。

I was sleeping at that time.