He served in many other towns. Often,all he had to do was walk into a room to stop a fight.

VOA: special.2010.03.10

Now consider suppose a whole another 500 people walk into this room suddenly, now there's 1,000 people.

现在假设教室又进来500人,总数就成了1000人。

哈佛公开课 - 计算机科学课程节选