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

非洲树蛇的蛇皮碎片，那是学生储藏柜里绝有的。

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.

年级的时候拿了非洲树蛇皮——他们需要用它来配制复方汤剂——当时斯内普怀疑到了哈利，但一直有证据。