polar
发音
How to pronounce polar in British English:
英 [ˈpəʊlə(r)]
How to pronounce polar in American English:
美 [ˈpoʊlər]
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- Adjective:
- having a pair of equal and opposite charges
- characterized by opposite extremes; completely opposed
- located at or near or coming from the earth's poles
- of or existing at or near a geographical pole or within the Arctic or Antarctic Circles
- extremely cold
- being of crucial importance
单词词源
- polar (adj.)
- 1550s, from Middle French polaire (16c.) or directly from Medieval Latin polaris "of or pertaining to the poles," from Latin polus "an end of an axis" (see pole (n.2)). Meaning "directly opposite in character or tendency" is attested from 1832. Polar bear first recorded 1781.
双语例句
- 1. The moon was once thought to be dry . Then came hints of ice in the polar craters .
- 2. One concerned a 20-year-old hypothesis , supported by radar observations from earth , that suggested some polar craters might hide reserves of water-ice .
- 3. The deposits in the lunar craters may be as informative about the moon as ice cores from earth 's polar regions are about the planet 's past climates .
- 4. Between now and early september , when the polar pack ice shrivels to its summer minimum , they will pore over the daily sea ice reports of america 's national snow and ice data centre .
- 5. The result , according to a modeling study published earlier this month the journal of geophysical research , is a strong high-pressure system over the newly exposed sea which brings cold polar air , swirling counter-clockwise , into europe .