求翻译：As he said the words, Harry flashed back to memories of Snape: facing Quirrell in the Dark Corridor and using his enthralling voice to intimidate the nervous man; scowling harshly as he taught Harry lifesaving defense magic; teaching him Occlumency even after his most humiliating memory had been revealed; grudgingly giving approval after his student mastered a particularly difficult lesson; saving Harry from the machinations of his own Slytherin students.是什么意思？

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