Layers of frozen sea water, known as sea ice, cap the Arctic Ocean. The ice grows dramatically each winter, and melts just as dramatically each summer.
北冰洋的冰层由结冰的海水构成，这些冰层在每年的冬天急速冻结，又在每年的夏天迅速消融。
Layers of frozen sea water, known as sea ice, cap the Arctic Ocean. The ice grows dramatically each winter, and melts just as dramatically each summer.
北冰洋的冰层由结冰的海水构成，这些冰层在每年的冬天急速冻结，又在每年的夏天迅速消融。
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