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.
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