即使不考虑未经证实的古代海洋迹象，流出渠道的范围表明，过去火星上存在着大量的水资源。
Even setting aside the unproven hints of ancient oceans, the extent of the outflow channels suggests that a huge total volume of water existed on Mars in the past.
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.
例如，有细菌性食物时，古代的祖先会打开基因的表达，这些基因允许他们爬过去并且吞噬他们的捕食。
For example, in the presence of bacterial food, the ancient ancestors turned on the expression of genes that allowed them to crawl around and engulf their prey.
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