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polar region
avia.	极区 (地球两极附近的区域，无确定界限)
oil	极地
space	极区
tech.	近极区域
polar region Area relating to the earth's poles or the area inside the Arctic or Antarctic Circles
environ.	极地 (该区域的地球磁极分别为北极和南极。)

polar region: 9 phrases in 6 subjects

Agriculture	1
Chemistry	1
Desert science	1
Earth sciences	1
Space	3
Technology	2