Dr.Rwagacondo says if children get sick, they don't go to school and fall behind scholastically.

VOA: standard.2009.04.25

Would the winner of the war slaughter the enemy that would fall behind or would they give them back?

战争胜利的一方会屠杀对方落在后面的人,还是任其溃逃

耶鲁公开课 - 古希腊历史简介课程节选

you have to like keep working it until... so that you don't fall behind.

你就要不断地工作学习直到……这样你才能不落后。

都是天才 - SpeakingMax英语口语达人

Right? Now, unfortunatly, I myself just do not fall behind that idea, and I'll tell you why.

不错，但是恐怕我自己,不同意这种观点，我来告诉你为什么。

普林斯顿公开课 - 人性课程节选

No doubt at some point I'll fall behind.

毫无疑问，某些方面我会落后。

耶鲁公开课 - 死亡课程节选