由来已久的英文
“由来已久”对应的英文单词有：be as old as the hills、longstanding ，一共2个，具体意思及用法如下：
be as old as the hills由来已久
longstanding长时间的，长期存在的
与由来已久相关的短语
是由来已久的问题has been a long-standing problem
由来已久的杀手The flua historical killer
由来已久的风俗习惯institution
由来已久的age-old;long-standing;Deep Seated