s. having a pair of equal and opposite charges
a. located at or near or coming from the earth's poles
a. of or existing at or near a geographical pole or within the Arctic or Antarctic Circles
a. 两极的, 极地的, 正好相反的, 极性的
n. 极线, 极面
1. The polar bear lives in the Arctic region.
北极熊生活在北极地区。
2. Scientists study polar climates to understand climate change.
科学家研究极地气候以了解气候变化。
3. The polar opposite of hot is cold.
热的极端是冷。