A study suggests that the Arctic "may be essentially ice-free during summer within 15 years."
一项研究显示，北极"在15年内可能会在夏季基本无冰"。
The study used statistical models to predict the future amount of Arctic ice, which suggested that the Arctic could be ice-free in the summer during the decade of the 2030s – most likely in the year 2034.
该研究利用统计模型预测了北极冰层的未来数量，表明在21世纪30年代的十年里，极有可能是在2034年，北极可能会在夏季无冰。
Sea ice is frozen ocean water that melts each summer, then refreezes each winter.
海冰是冻结的海水，每年夏季融化，然后每年冬季重新冻结。
The amount of summer sea ice in the Arctic has been steadily shrinking over the past few decades because of global warming.
由于全球变暖，过去几十年来，北极夏季海冰的数量一直在稳步减少。
It reached its second-smallest level on record in 2019, the National Oceanic and Atmospheric Administration said.
美国国家海洋和大气管理局说，2019年北极夏季海冰水平仅次于历史最低记录。
What scientists refer to as the first "ice-free" Arctic summer year will occur when the Arctic has less than 1 million square kilometers of sea ice.
科学家所说的首个“无冰”北极夏季的年份将出现在北极海冰不足100万平方公里的时候。
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