A long-standing situation has existed for a long time.
例句
They are on the brink of resolving their long-standing dispute over money.他们很快就能解决长期以来的金钱纠纷。...long-standing economic links between Europe and much of Africa.欧洲和非洲大部分地区由来已久的经贸联系
英英词典释义
Adjective
1. having existed for a long time;
"a longstanding friendship""the longstanding conflict"