The Dutch have been fighting the rising and falling tides for centuries, building dikes and pumping water out of areas that are below sea level.
荷兰人几个世纪以来一直在不断地与大自然的潮涨潮落相抗争，不停地筑堤挖渠，将积水从低于海平面的地区抽走。
The hands reach up either to the right or left of the body and the fingers move or wiggle like falling water as the hands sweep down to waist level.
双手伸出，一只向身体的右边一只向身体的左边，当双手向下经过腰部手指动起来或摆动像水落下。
When the water level is falling, the free surface line of saturate theory is lower than saturate-unsaturated.
水位下降时，饱和理论比饱和—非饱理论计算的渗流自由面下降要快。
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