I screwed up again!

我又搞砸了！

youdao

I was trying to help but I screwed up again.

我本想帮忙，反而又把事情搞糟了。

youdao

Secondly, as we go to the more advanced part of the course, we'll take a result from this part of the blackboard, stick it into the second part and keep manipulating, so if I screwed up in the beginning and you guys keep quiet, we'll have to do the whole thing again.

其次,随着我们课程的深入,我们需要把黑板这边的计算结果,抄到黑板的那边,不停地这么做,如果我一开始就写错了,而你们又不出声,我们就得全部重新来过

耶鲁公开课 - 基础物理课程节选

And until he looks the loss right in the eye and says I screwed up, he's not going to be a factor again.

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