a closed book完全不了解,搞不懂
closed adj. 关闭的;合上的
与an open book意思相反
He is
such a closed book, he never talks about himself.他这人很封闭,从来不谈论他自己。
I don’t know much ...
by the book 完全按照规章制度办事,按照规定,照章办事
go by the book 依章办事
play by the book按规定来
do something by the book按规定做某事
run something by the book 按规定管理、运营
The manager do...