I cannot remember.

我不记得了。

麻省理工公开课 - 固态化学导论课程节选

I am frustrated that I cannot remember this.

我没法记下来，真是让人泄气。

I'm frustrated 课堂 - SpeakingMax英语口语达人

What do I learn from the period? How？ Remember, you cannot peek into Chapters 6 and 7, because you've seen it before.

我能利用周期得到什么结论,怎么做,记住,你不能跳到第六章和第七章,即使你看过了

耶鲁公开课 - 基础物理课程节选