https://online2.tingclass.net/lesson/shi0529/0009/9907/789.mp3
https://image.tingclass.net/statics/js/2012
the ins and outs 復(fù)雜細(xì)節(jié)，前前后后，來(lái)龍去脈
Mike knows the ins and outs of the city.
麥克對(duì)這座城市了如指掌。
Be sure to understand the ins and outs of the platform.
一定要對(duì)這個(gè)平臺(tái)有徹底的理解。
