多年来 duōniánlái for the past many years
How to remember 多年来: 多 many + 年 year + 来 come = for the past many years.
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How it is used
- Over the years / for many years (up to now) - 多年来一直坚持 (duōniánlái yìzhí jiānchí) has kept it up for years.
- A time adverbial spanning a long stretch leading to the present; sets a retrospective frame. Neutral/written.