●ˌgo ˈback…1.if two people go back a period of time, they have known each other and have been friends for that time相识，已认识（一段时间）◆Adam and I go back a long way. 亚当和我是老相识了。2. ( ˌgo ˈback to sth) to have existed since a particular time in the past追溯到；回溯到◆Our friendship goes back fifteen years. 我们的友谊开始于十五年前。◆This tradition goes back to medieval times. 这个传统可上溯到中世纪。SYNdate back…, date back to sth3. ( ˌgo ˈback to sth) to consider sth that happened in the past回忆起，回到（先前的事）◆To trace the origins of the problem, we have to go back to the 18th century. 要对这个问题追根溯源，我们必须回到 18 世纪。◆I’m going back a few years now… (= I’m talking about sth that happened some years ago) 我现在要谈的是几年前的事…[v + adv]2, 3also[v + adv + prep]