fall of water level 水位降落 ; 水位下降
fall of water flow 水流落差
continuous fall of water level 水位持续下降
fall head of water 降落水头
The rise and fall of water columns look musical.
看水柱的上升和下降的音乐。
When more water power is wanted in a particular district, than there are falls of water to supply it, persons will give an equivalent for the use of a fall of water.
一旦某一地区对水力资源的需要量超过水利资源的供应量，人们就得为使用水利资源支付等价物。
If water levels fall in summer, as they do in most of North America, then beavers lodge entrances may be exposed.
如果夏季水位下降，就像在北美大部分地区所发生的那样，那么海狸居所入口可能会暴露。
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