在调查过去的气候条件时使用的一种非常古老的方法是测量古代湖泊的水位。
One very old method used in the investigation of past climatic conditions involves the measurement of water levels in ancient lakes.
在湖泊沉积物中发现了古代花粉的遗迹，这表明，该地区曾经是温和的热带。
Ancient pollen found in the sediment in the lakes has shown that the area was once mildly tropical.
而我们知道，出于我们对类似的古代沙漠湖泊的了解，我们知道这些湖泊并没有持续很长时间，平均从几个月到几年不等。
We know, because of what we know about similar ancient desert lakes, we know that the lakes didn't last very long, from a few months to a few years on average.
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