beginning of floating
开始浮动
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By the beginning of June, the ice cover-as defined by the percentage of ocean covered by at least 15% floating ice-had dropped far below what is usual for the time of year.
6月初，覆冰率(定义为洋面浮冰率15%以上的水域比例)远低于常年水平。
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