HSK V4
Correct

多年

/ duō nián / 
Strokes

Definition

for many years

Example

As a Noun
many years
1
Duōnián
多年
xuánàn
悬案

age-old question; case unresolved for many years

2
Duōnián
多年
jīxí
积习

crusted habit

3
Duōnián
多年
dòngtǔ
冻土

ever-frozen ground; permafrost

4
Duōnián
多年
bùjiàn
不见

have not met/seen each other for many years