The first time gives them the ultimate high,

他们第一次作案会最兴奋
and after that, no high is as good.

之后就再也达不到那种兴奋点了
Unfortunately, the addict doesn't know that.

不幸的是上瘾的人不知道这点
He will chase that high to the gates of insanity and death.

他会一直追求那种兴奋直到精神错乱或者死亡
By now, killing is all our unsub thinks about.

到如今嫌犯的内心被杀戮占据
He's set up the exact same situation again and again,

他多次重建当时的情景
hoping to get the same result.

希望得到相同的效果
He begins to think he's doing it wrong.

他会开始觉得自己的方式错了
He becomes obsessed with improving his skills, honing his M.O.

然后开始痴迷于提高技术磨练作案手法
And tailoring his weapon to his deadly purpose.

锯短他的武器以达到致命的效果
He figures if he gets them all just right,

他觉得如果各方面都做对了
if he can get his technique and his tools perfected,

如果他可以让技术和工具达到完美