I'll be wondering what on earth is Pepsi up to, but that's fine.

我会疑惑百事究竟想干嘛,但不管他了

耶鲁公开课 - 博弈论课程节选

and got a couple of compliments on my pictures, so figured, "Why not try this?"

然后照片受了点表扬，我就想“干嘛不试试这一行呢？”

拍照的理由 - SpeakingMax英语口语达人

You have an incentive to say, because you're the equity holder, you have an incentive to say, hey why don't I just take some big gamble here and not tell anybody.

因为你是这家公司的股东,可能就有动力促使你这样想,我干嘛不来赌上一把呢,我不会告诉别人的

耶鲁公开课 - 金融市场课程节选

Then, I was talking it over with another graduate student and he said, well if you want to find out why don't you ask J.R. Hicks?

随后,我和另一位研究生讨到了此问题,他说,如果你想知道,干嘛不直接去问J·R·希克斯

耶鲁公开课 - 金融市场课程节选