周口店附近的山地多为石灰岩，在水力作用下，形成许多大小不等的天然洞穴。
The mountains around Zhoukoudian are mostly made up of limestone which, under the erosion of dripping water, formed up into caves of various sizes.
塌岸破坏主要取决于水力作用、波浪冲击、水的浸泡、水位升降、河势变化等。
The destruction to the collapsed bank principally depends on water power, shock of wave, water soak, changes of water level and river topography and so on.
从中国实际出发，并结合全球水汽循环及水力作用，指出水土流失也是引起海平面升高的一个重要因素。
From the soil erosion state of China and the globe water circulating and the atmosphere falling action, point out that soil erosion is one of the factors of sea level going up.
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