The photographs actually show sand dunes coated with a thin layer of frozen carbon dioxide, or dry ice, less than 240 miles from the planet's north pole.

这张图片实际显示的，是距离火星北极不足240英里的沙丘上覆盖的一层薄薄的冰冻二氧化碳、或干冰。

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The white material at the top of the cliff, near the planet's North Pole, is carbon dioxide ice.

照片上显示的悬崖上的白色物质是位于火星北极地区的干冰。

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A warmer pole means higher sea levels and a thaw in the arctic permafrost would lead to even more methane and carbon dioxide being released into the atmosphere.

暖极代表海平面上升和在北极永久冻土层解冻，会引起更多的沼气和碳排放量释放到大气层。

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An annual winter chills the southern hemisphere, creating around the pole a frost composed in large part of frozen carbon dioxide, or dry ice.

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Father Thomas Reese believes the Pole brought unique skills to the papacy, and whoever succeeds him will not be a carbon copy.

BBC: NEWS | Europe | The legacy of John Paul II