Tsunamis travel as fast as jet aircraft in deep water, where they are spread over a far deeper water column and make for smaller and very gradual waves at the surface.

在深海水域，海啸的传播速度像喷气式飞机一样快，但在海面看到的波浪不大。

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Many people use a float to wind down or to get over jet-lag -- as a deeply relaxing float has much in common with a deep sleep.

CNN: Floating to good health