We are going to have to stop doing that because we cannot find an individual electron.

我们正要停止那么做,因为无法发现一个独立电子。

麻省理工公开课 - 固态化学导论课程节选

My assistant will tell you that she often cannot find me because my favorite thing is to escape and just wander around the institution.

我的助手会告诉你,她常常找不到我,因为我最爱做的事情就是,“逃出”办公室，到医院里到处巡视。

普林斯顿公开课 - 领导能力简介课程节选

Well you just cannot find bagels that small.

根本没法找到这么小的百吉饼

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选