for one thing
US /fɔːr wʌn θɪŋ/
UK /fɔːr wʌn θɪŋ/

1.
우선, 첫째로
used to introduce one reason, among others, for something
:
•
I can't go out tonight; for one thing, I have to study.
오늘 밤 외출할 수 없어. 우선 공부해야 해.
•
Why didn't you tell me? Well, for one thing, you were busy.
왜 말 안 해줬어? 음, 우선 네가 바빴잖아.