1 PHRASAL VERB 恢复;重新开始;重操(旧业) If you go back to a task or activity, you start doing it again after you have stopped doing it for a period of time. 恢复;重新开始;重操(旧业)
2 PHRASAL VERB 回到(原来的话题等) If you go back to a particular point in a lecture, discussion, or book, you start to discuss it. 回到(原来的话题等)