The quake off Sumatra happened at around 0800 local time, causing a giant rupture in the sea bed, which set a huge body of water moving at a speed of up to 700kph.
苏门答腊地震发生于当地时间约早上8点，造成海底巨大裂缝，引起大量的海水以高达700公里/小时的速度前进。
The hairs flutter in moving water as flags do in moving air, and the way in which they flutter contains information about the direction and speed of the water moving past them.
绒毛在水中就像气流中的旗帜一样摆动，它们摆动的方式包含着流经它们的水流方向和流速信息。
Fast-moving neutrons are produced by fission reaction in a nuclear reactor. Water is commonly used to moderate and control the speed of neutrons.
核电站的核反应堆中，核裂变会产生高速移动的中子，通常是用水去阻隔及控制中子的移动速度。
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