the ins and outs of
US /ðə ɪnz ænd aʊts əv/
UK /ðə ɪnz ænd aʊts əv/
成语
来龙去脉, 全部细节
all the details, procedures, and complexities of something
示例:
•
She knows the ins and outs of the legal system.
她了解法律体系的来龙去脉。
•
I need to learn the ins and outs of this new software.
我需要了解这款新软件的来龙去脉。