https://online2.tingclass.net/lesson/shi0529/0009/9907/537.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
back on track 重回正轨，重上轨道，改过自新，恢复正常
We still have a lot of work to do to get everything back on track.
要让一切回到正轨的话，我们还需多多努力。
His business is already back on track.
他的生意已经重回正轨。
疯狂练习吧!
