https://online2.tingclass.net/lesson/shi0529/0009/9907/789.mp3
https://image.tingclass.net/statics/js/2012
the ins and outs 复杂细节，前前后后，来龙去脉
Mike knows the ins and outs of the city.
麦克对这座城市了如指掌。
Be sure to understand the ins and outs of the platform.
一定要对这个平台有彻底的理解。
