He would only do that

只有当他选好了下一个
if he had another boy waiting in the wings.

他才会处理手头上的孩子
That means he met his victims before.

也就是说他之前认识这些孩子们
How? I mean, they're hours apart.

这要怎么做到两者才相隔几个小时
Look at the towns. He had subdivisions in all of them.

看看这地图到处都有他施过工的建筑
Construction sites are a magnet for 10- to 12-year-old boys.

建筑工地对10到12岁的男孩很有吸引力
He...

他...
He gave kids a ride on the backhoe all the time.

他总是让孩子们坐他的挖沟机
They would just line up for it.

他们还会排队来坐
Oh, my god. I-- i--I didn't know.

天呐我...我不知道会是这样
We found his target-rich environment.

我们可能找到了他的作案地点
The construction sites?

建筑工地吗