strong suit

US /ˈstrɔŋ suːt/
UK /ˈstrɔŋ suːt/
"strong suit" picture
1.

強項, 擅長

a particular aptitude or talent; a strength

:
Public speaking is not my strong suit.
公開演講不是我的強項
Math has always been his strong suit.
數學一直是他的強項