the thing is

US /ðə θɪŋ ɪz/
UK /ðə θɪŋ ɪz/
"the thing is" picture
1.

問題是, 關鍵是

used to introduce a statement that explains the most important aspect of a situation or problem

:
I'd love to help, but the thing is, I'm really busy this week.
我很想幫忙,但問題是,我這週真的很忙。
He said he'd be here, but the thing is, he often forgets.
他說他會來,但問題是,他經常忘記。