愉悦口语:第789期 来龙去脉英文怎么说

 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。