多种环境因素都起到作用，例如，积雪过多会让树木透不过气，雪崩和雪移能摧毁树木；

Various environmental factors may play a role. Too much snow, for example, can smother trees, and avalanches and snow creep can damage or destroy them.

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“我相信是幻觉，”赫敏说，显得有点紧张，“黑暗中的雪，容易让人的眼睛产生错觉……但也许我们应该在隐形衣下面幻影移形，以防万一，对吗？”

"I'm sure I imagined it," said Hermione, looking nervous. "the snow in the dark, it plays tricks on your eyes."... But perhaps we ought to Disapparate under the Invisibility Cloak, just in case?

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