The study found an average ice cover of about fifteen million square kilometers in March.
研究发现三月的平均冰覆盖量大约是一千五百万平方公里。
Thousands march for miles, often in snow and ice, singing and playing music.
上万人通常在冰天雪地里行进数里路，唱着歌、奏着乐。
Thousands march for miles, often in snow and ice, singing and playing music.
上万人通常在冰天雪地里行进数里路，唱着歌、奏着乐。
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