形容詞 long-ago:

1. belonging to time long gone

副詞 long-ago:

1. of the distant or comparatively distant past is Scottish
   同義詞：long ago, long since, lang syne

long-a.go

adj.（形容詞）
Of, related to, or occurring in the past:
以前的，往日的：過(guò)去的、與過(guò)去有關(guān)的或發(fā)生于過(guò)去的：
例句：
a long-ago espionage trial.
以前的間諜審判