be in apple-pie order
US /bi ɪn ˈæp.əl.paɪ ˈɔːr.dər/
UK /bi ɪn ˈæp.əl.paɪ ˈɔːr.dər/

1.
井然有序, 整潔如新
to be perfectly neat, tidy, and organized
:
•
After she cleaned the house, everything was in apple-pie order.
她打掃完房子後,一切都井然有序。
•
The manager likes to keep his office in apple-pie order.
經理喜歡把他的辦公室整理得井井有條。