in and out
US /ɪn ənd aʊt/
UK /ɪn ənd aʊt/
成語
1.
進進出出, 來來回回
moving into and then out of a place, or repeatedly entering and leaving
範例:
•
The children were running in and out of the house all afternoon.
孩子們整個下午都在屋子裡進進出出。
•
He's been in and out of the hospital for weeks.
他已經進出醫院好幾週了。
2.
了如指掌, 徹底
having a thorough knowledge of something
範例:
•
She knows the business in and out.
她對這行了如指掌。
•
You need to understand the system in and out to fix it.
你需要徹底了解這個系統才能修復它。