You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.

我们完成计算时，一定要记得检查符号,因为很容易弄错符号，刚才我就不太确定,是否弄错了符号，检查发现没有问题。

麻省理工公开课 - 热力学与动力学课程节选

Well, I think that, if I'm not mistaking, he discovered America.

我想，如果我没弄错的话，是他发现了美洲。

向哥伦布学习 - SpeakingMax英语口语达人

And they raise the HDL-- I mean it is good for you that -well let's see, okay, no I got that wrong.

它们会增加高密度脂蛋白,就是说对身体有益,哦,不,我弄错了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Did I jump to the wrong place?

我弄错了么？

麻省理工公开课 - 计算机科学及编程导论课程节选

Okay, well I'm sorry about that.

我很抱歉,我弄错了

耶鲁公开课 - 金融市场课程节选