b)spoken used to emphasize that something is true 這是肯定的,毫無疑問〔用於強調某事真實〕
We’ll always need teachers, that’s for sure.
我們永遠都需要教師,這是肯定的。
c)American EnglishAmE informal spoken used to agree with someone 當然,肯定〔用於表示同意〕
Examples from the Corpus
that’s for sure• He wasn't using drugs, that's for sure.• Because she was beautiful and couldn't do enough for me, that's for sure.• Certainly not in the Aero-Space industry, that's for sure.• He's the hardest man to get out, that's for sure.• International business man, that's for sure.• Sanders also ain't gonna like it, that's for sure.• They'd have to move to a smaller house, that's for sure.• It was not the breathing of a seventeen-year-old, that's for sure, but something more sonorous.