She's just having a bad day.

她只是今天过得不太顺利。

You look 课堂 - SpeakingMax英语口语达人

All right, you can't sue Yale later if you had a bad hair day.

发现你糟糕的发型可别起诉耶鲁大学

耶鲁公开课 - 博弈论课程节选

I'm having a bad day.

真是糟糕的一天。

I can't 实战 - SpeakingMax英语口语达人

Think of this as a bad hair day release form.

大家考虑好,日后你要是在视频里

耶鲁公开课 - 博弈论课程节选

I'm not going to put Yale's entire portfolio in Google stock, I'm not going to go back and take Yale's entire portfolio to day-trade bond futures; in part, because it would be bad for me personally.

我不会用耶鲁的全部资产买谷歌股票,我也不会,用耶鲁的全部资产买债券期货,一方面是因为,这对我个人不利

耶鲁公开课 - 金融市场课程节选