731做过的全部实验书籍摘要：Hermione ploughed her way back to Hagrid's cabin through two feet of snow on Sunday morning. Harry and Ron wanted to go with her, but their mountain of homework had reached an alarming height again, so they remained grudgingly in the common room, Tying to ignore the gleeful shouts drifting up from the grounds outside, where students were enjoying themselves skating on the frozen lake, tobogganing and, worst of all, bewitching snowballs to zoom up to Gryffindor Tower and rap hard on the windows.她问祁岚，有没有什么好的活动。……
