Shredded skin of a boomslang, that's definitely not in the students' cupboard.

蛇的蛇皮碎，学生储藏柜里绝对没有的。

Hermione had taken the boomslang skin back in their second year-they had needed it for the Polyjuice Potion-and while Snape had suspected Harry at the time, he had never been able to prove it.

赫敏二年级的时候拿了蛇皮——他们需要用它来配制复方汤剂——当时斯内普怀疑到了哈利，但一直没有证据。