I mean, how many serial killers move around like that?

有几个连环杀手会像他那样来回打游击战
Not many.

很少
Of the ones who do, we categorize them into two subgroups.

而会这么做的罪犯可以分为两类
In one model,he's an itinerant homeless person,

一种情况此人是个无家可归的流动人员
someone who's been displaced.

居无定所
With the second type,their occupation allows them to travel.

另一种情况他们的职业允许他们到处流窜
He could be killing while on business.

他可以一边工作一边作案
A truck driver make sense?

会不会是卡车司机
Long-haul truck driver Bruce Mendenhall shot his victims,

长途运输司机布鲁斯·门登霍尔曾射杀被害人
and disposed of their bodies at truck

然后载着他们的尸体
across at least 4 different states.

跨越至少四个州
But Mendenhall targeted mostly high-risk victims.

但是门登霍尔只挑高风险被害人