一次伏地魔被提议对斯内普进行听审，但是，斯内普的大脑封闭术使自己免于暴露在伏地魔的思维穿透术下。
Once Voldemort was persuaded to give Snape a hearing , however , snape 's skills as an occlumens would have protected him from exposure via voldemort 's use of legilimency .
大脑封闭术