duō​nián HSK4

many years

多年 duō​nián
many years adjective
a period spanning a long time; occurring over several years

The two of us have known each other for many years.

longstanding adjective
having existed or persisted for many years; long-term

Due to years of accumulated resentment, they ignore each other.

Frequency

Movie subtitles
7.57 per million appears in 4% of films
Written text
64.3 per million

Details

HSK 3.0
Level 4

Sources

Definitions
CC-CEDICT