arctic clear
北极清晰
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Average monthly Arctic sea ice extent data shows a clear deceasing trend since 1979.
UNESCO: Social and Human Sciences
Diary entries of a sailor named Roald Amundson confirm clear passage in 1903, as do those of a Royal Canadian Mounted Police Arctic patrol crew that made regular trips through there in the early 1940s.
FORBES: Magazine Article
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