Natural slope usually has a zestier of strong unloading and a zestier of weak unloading and corresponding zone of strong (or weak) weathering, and there is integrity fresh rock in its inside.
河谷天然岸坡通常由坡面向内有一个强卸荷带和弱卸荷带以及相应的强风化和弱风化带，内侧则为完整新鲜的岩石。
Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.
撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。
Shale traps gas more tightly than other rock. To extract it, the shale is blasted with huge volumes of fresh water at high pressure, a practice known as hydraulic fracturing, or "fracking".
页岩储藏气体比其他岩石更密封，要从中抽取就必须用海量淡水在高压下炸开页岩并，这种方法叫做水压致裂法。
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