单词	polar front
释义	polar front noun : the boundary between the cold air of a polar region and the warmer air of lower latitudes Example Sentences Recent Examples on the Web And those anomalous years offer a preview of how the Southern Ocean is expected to warm in the coming decades, steadily shifting the polar front farther south. Eli Kintisch, Science | AAAS, 19 Mar. 2020 The polar front doesn’t stay in the same place every year. Eli Kintisch, Science | AAAS, 19 Mar. 2020 Adult penguins take turns to forage for food, traveling hundreds of miles to reach the Antarctic polar front—a nutrient-rich stretch of ocean where cold deep water meets warmer patches. Julissa Treviño, Smithsonian, 1 Mar. 2018 In addition to a reliable source of food like the Antarctic polar front, king penguins also need tolerable temperatures, islands with smooth beaches (not rocky ones) and relatively little ice, Hignett writes. Julissa Treviño, Smithsonian, 1 Mar. 2018 Word History First Known Use 1920, in the meaning defined above
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