Why didn't he see the Thestrals before?

为什么之前他没有见到夜骐？

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Neville too can see the Thestrals ( OP21).

纳威也能看到夜骐（OP21）。

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Harry has never seen the Thestrals pulling the school carriages before, but he has witnessed death several times: his mother and Cedric.

哈利以前从没有见过给学校拉车的夜骐，但他目睹死亡有两次了：他的妈妈和塞德里克。

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