尽管目前的火星看起来干燥和寒冷，没有生命，地质标记比如溪谷，干的湖床和巨大的峡谷指向液体的过去。
Although Mars today looks dry and cold - dead - geological markings like gullies, dry lake beds and colossal canyons point to a liquid past.
尽管目前的火星看起来干燥和寒冷，没有生命，地质标记比如溪谷，干的湖床和巨大的峡谷指向液体的过去。
Although Mars today looks dry and cold - dead - geological markings like gullies, dry lake beds and colossal canyons point to a liquid past.
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