To research the environmental problems of estuaries and coastal seas, we must learn the tidal flow field in detail firstly.
所以在近海工程及环境问题的研究中，必须首先要对潮流场有一个详细的了解。
Tidal waves move faster than any wheeled vehicle on earth. On the open seas they sometimes approach speeds of more than 500 nautical miles per hour.
海浪运动的速度超过地球上的任何车辆。在公海上海浪的时速有时可接近500海里。
The coverage of tidal gauges is patchy. Most are in coastal waters, so the high seas are poorly measured. The majority are in the northern hemisphere. Few are near the poles.
潮位计的覆盖是不全面的，大多数在沿海水域，所以高海拔的海域很少被测定。
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