They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

If any of you don't want your image recorded and posted on the web, you're supposed to sit in the back three rows.

如果你们中的任何一位,不希望被拍摄下来并被放到网络上，你们可以坐到后面三排去。

麻省理工公开课 - 计算机科学及编程导论课程节选

Now, if you are standing there with your -- by the way the first three rows have a chance of hitting each other.

现在,如果你站在那里用你的 --,顺便提一下前三排有机会互相攻击

耶鲁公开课 - 古希腊历史简介课程节选

So there's obviously three rows but conceptually, how did I get to 3?

显然一共有3行,但是我是如何得到3的呢？

哈佛公开课 - 计算机科学课程节选

Can I get the guy way back, like three rows behind you in purple?

请倒数第三排的紫衣人回答

耶鲁公开课 - 博弈论课程节选