法醫

一開始法醫團隊以為他們發現了人血，但後來才在實驗室裡發現這原來是牛血。

yì kāishǐ fǎyī tuánduì yǐwéi tāmen fāxiàn le rén xiě dàn hòulái cái zài shíyànshì lǐ fāxiàn zhè yuánlái shì niú xiě

At first the forensics team thought that they'd discovered human blood, only to find out later, at the lab, that it was bovine.