hark back

• • (猎犬)循原路回来重找嗅迹；(使)回归原处；(使)折回：

    His hounds harked back to the dells.

    他的那群猎狗又返回到小谷。

  • 回到本题；重提，回想：

    I have to hark back to this question that I mentioned earlier on in order to let you understand how serious it is.

    为了让你认识到情况有多严重，我还得重提一下我先前提到的这个问题。