我们知道，龙卷风在它的旋转管道里有一个无风点，而管道边上却有风速很快的风。
As is known, a tornado has a calm in the center of the swirling tube, the high winds at the edges of the tube.
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。
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.
然而，中国房地产行业在历经多年的过热发展后，正艰难度过寒冬期。从这一点能够看出，万科发行的债券也并非毫无风险。
But the Chinese property business is going through a painful retrenchment after years of overbuilding, which suggests Vanke's bonds are not without their risks.
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