对不可压缩边界层或平面槽道流，还会出现典型的三维结构。

For incompressible boundary layer or plane channel flow, typical three-dimensional structures would appear.

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之后他们压缩减压能产生声波的这种气体。数据表示部分冷凝物的速度超过声速，因此他们制出了声音的黑洞边界。

Their data showed that the speed of part of the condensate exceeded the speed of sound, and they had therefore made an acoustic event horizon.

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匈牙利边界被压缩，他们满意吗？

Will Hungarians be content with their constricted borders?

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