The difficulties of computer algorithm of designed tide level are looking up and counting the relevant tables and drawing the frequency curves.

设计潮位的计算机算法，其难点是有关的表格查算和绘制频率曲线图。

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The result indicates that this method is effective and utility to recognize the sudden change which is led by man or nature in tide level time series.

结果表明，文中所用的方法对识别人为或自然因素引起的潮位时间序列中的突变成份是有效的，具有一定的实用价值。

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In the plane layout of double dikes, the sudden expansion or contraction should be avoided. The elevation of the top of the dike should be identical with middle tide level.

双导堤平面布置不宜呈突然扩大或收缩状，堤顶高程宜与中潮位一致。

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Located at the thin end of the Thames tidal estuary, it is considered to be one of the cities most under threat from rising sea levels with around 150 square kilometers located below high tide level -- home to more than one million Londoners.

CNN: London leads climate change fight

What I know for sure is that the Iraqi security forces will reach the critical mass level where we have turned the tide around and the insurgents and the terrorists are on the run and we are chasing them.

NPR: An Iraqi Perspective on Ending the War