在冬季时，二氧化碳脱离大气冷凝成固体二氧化碳(干冰)覆盖在星球的极地地区。
During winter, carbon dioxide condenses out of the atmosphere and forms a frost of dry ice that coats the planet's polar region.
每年春季，火星表面的干冰(固体二氧化碳)在阳光照射下，会由固态升华为气态。
Spring on Mars sees plumes of carbon dioxide vaporizing from solid blocks of dry ice as they warm up in the sunlight.
另一方面，该固体不是干冰(二氧化碳固体)。
On the other hand, the solid is NOT dry ice (carbon dioxide solid).
另一方面，该固体不是干冰(二氧化碳固体)。
On the other hand, the solid is NOT dry ice (carbon dioxide solid).
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