它也有空气、季节和独特的极地冰冠。
It has an atmosphere, seasons, and distinctive pol ar ice caps.
图中另一块明亮的区域则是北冰洋的极地冰冠。
The other bright region in the image is the polar ice cap over the Arctic Ocean.
尤伯和她的同事也分析了火星上要大得多的北部极地冰冠。
Zuber and her colleagues also analyzed Mars's much larger northern polar cap.
自1979年以来，夏天极地冰冠缩小的规模达20%以上。（插图由美国航天局提供）
Since 1979, the size of the summer polar ice cap has shrunk more than 20 percent. (Illustration from NASA)
极地冰冠后退在环北极国家中引发了热议。 随着冰冠消融，下面蕴藏的丰富自然资源将首次浮出水面。
Much has been made about conflicts between Arctic states because of a retreating polar ice cap, which will make many natural resources accessible for the first time.
相对将极地的冰冠气化成“干冰”，这样的温度仍然足够“温暖了”。
It's still 'warm' enough, relatively speaking, to make the 'dry ice' of the polar ice caps boil off.
北部冰冠位于基本覆盖了整个火星北半球的一个深奥的凹陷处的内部，在接近极地处，海拔下降。
The northern ice cap sits nestled within a deep depression that covers essentially the entire northern hemisphere of Mars and drops in elevation as it nears the pole.
北部冰冠位于基本覆盖了整个火星北半球的一个深奥的凹陷处的内部，在接近极地处，海拔下降。
The northern ice cap sits nestled within a deep depression that covers essentially the entire northern hemisphere of Mars and drops in elevation as it nears the pole.
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