uzun süredir var olan

listen to the pronunciation of uzun süredir var olan
التركية - الإنجليزية
longstanding
Having persisted for an extended period of time

After many years the longstanding disagreement broke into open legal action.

having existed for a long time; "a longstanding friendship"; "the longstanding conflict
having existed for a long time; "a longstanding friendship"; "the longstanding conflict"
Describing something that has persisted for an extended period of time
{s} existing for a long time, of long duration
uzun süredir var olan
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