sea-ice frequency 海冰频率
ice force frequency 冰力频率
ice frequency
冰的频率
以上为机器翻译结果，长、整句建议使用 人工翻译 。
As the earth gradually recovers from the Little Ice Age (which lasted from approximately 1300 to 1900 A.D.), the frequency of major hurricane strikes is declining rather than increasing.
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