Now, these two girls couldn't be any more different.

两个女孩子的差异非常大
But the one thing that they had in common

她们唯一的共同点就是遇上了
is they both crossed paths

这个行为分析组碰到的
with the most prolific serial killer the BAU has ever seen.

犯案次数最多的连环杀手
One thing you should understand is that no two killers are the same.

大家得明白没有两个连环杀手是一样的
They each occupy their own point on the behavioral spectrum.

他们在行为分析界有各自的特点
Genetics, brain chemistry, psychology, and environment

遗传学脑化学心理学以及环境
are all factors.

都是需要考虑的因素
But we believe that this particular killer

我们认为这个连环杀手成长于
grew up in an environment so adverse

一个对他极为不利的环境当中
that he never had a chance.

他根本就没有机会做好人
Bastard!

混蛋