地球表面低重力直接导致了火星上火山的巨大高度。
The great height of Martian volcanoes is a direct consequence of the planet's low surface gravity.
飞往火星需要六个月。火星具有表面重力、稀薄的大气、冰冻的水、二氧化碳和基本矿物质。
Mars is a six-month flight away, and it has surface gravity, a thin atmosphere, frozen water, carbon dioxide and essential minerals.
两个行星之间最大的不同就是，火星表面的重力比地球上小得多——准确地说，比地球低62%。
But one big difference is that the gravity on Mars' surface is much lower than it is here on Earth - 62% lower to be precise.
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