随着海啸靠近海岸，波浪的速度会减至每小时约20英里到30英里。
As it approaches the coast, the wave slows down to about 20 to 30 miles an hour.
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。
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.
猛烈的飓风以120千米每小时甚至更快的速度移动，引起巨大的波浪，大雨和洪水。
There are violent winds of 120 kilometres per hour or more, which cause huge waves, heavy rain and floods.
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