·2,447,543篇论文数据，部分数据来源于NoteExpress
The calm in the center of an incomplete tornado allows the cloud cover to remain in place, where at the edges of the swirl the cloud cover is torn away.
一个不完全的龙卷风中心的无风点使得覆盖云不挪动位置，呆在了原处，而旋转管道边缘处的覆盖云却被撕碎了。
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