That means the song is so old, no one really knows who wrote it.

VOA: special.2009.07.27

So people were dying of old age and that was really heart disease that was killing them they just didn't know, so it's multi-factorial and we'll talk about that.

老死的人实际是死于心脏病,只不过人们不知道这一点罢了,这是个多因素的问题,我们以后会进一步探讨

耶鲁公开课 - 生物医学工程探索课程节选

So that's really cute when they are five years old and they are saying that.

他们才五岁所以说那一些话很可爱.

记忆深刻的研究 - SpeakingMax英语口语达人

But you're starting to really feel concerned about this old woman, so you say, "Let me hold your bag."

但是你开始为她担心了，于是你说，“Let me hold your bag.”

Let me 课堂 - SpeakingMax英语口语达人