自然杀伤细胞是一类与T细胞和B细胞不同的淋巴细胞，可在未被致敏的情况下破坏外来细胞(如肿瘤细胞)。
Natural killer cells, which are a class of lymphocyte distinct from t cells and B cells, destroy foreign cells (eg, neoplastic cells) even without prior sensitization.
就像帕特里克先生说的，鬼魂与“活人”交往，如哈利、罗恩和赫敏。
They interact with "live 'uns, " as Sir Patrick said, referring to Harry, Ron, and Hermione.
赫敏登上台阶，长长的黑发在身后如波浪般飘荡。
Hermione's long black hair rippled behind her as she climbed the steps.
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