这些山丘是早期地质时代的遗留物，大部分土壤已被刮光，遭受风吹日晒。
The hills are remnants of an earlier geological era, scraped bare of most soil and exposed to the elements.
确实，在一些雨水和地表水丰富并且地质和土壤环境理想的地方，地下含水层可以很快就得到补充。
In some places it is indeed replenished quite quickly if rain or surface water is available and the geological and soil conditions are favourable.
土壤中含有着石器时代的人影响的证据，波瑟解释说，这一个时期作为一个独立的地质时代来说已经有很长一段时间了。
The soil contains evidence of the influence of man since the Stone age, bose explains, and this age has already been treated as an independent geological era for a long time.
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