strong suit
得意分野
Ex
- Marketing is my strong suit.
- Accounting isn’t my strong suit.
Reference source
- https://nic-english.com/phrase/%E3%83%9E%E3%83%BC%E3%82%B1%E3%83%86%E3%82%A3%E3%83%B3%E3%82%B0%E3%81%AF%E7%A7%81%E3%81%AE%E5%BE%97%E6%84%8F%E5%88%86%E9%87%8E%E3%81%98%E3%82%83%E3%81%AA%E3%81%84%E3%80%82-marketing-isnt-my-strong/