have a bee in your bonnet

US /hæv ə bi ɪn jʊər ˈbɑːnɪt/
UK /hæv ə bi ɪn jʊər ˈbɑːnɪt/
"have a bee in your bonnet" picture
1.

著了魔, 念念不忘

to keep talking about something again and again because you think it is very important

:
She really has a bee in her bonnet about recycling.
她對回收利用真是著了魔
He's always got a bee in his bonnet about punctuality.
他總是對守時念念不忘