同义词: dawn dawning morning first light daybreak break of day break of the day dayspring sunrise sunup cockcrow
以上来源于: WordNet
N an atmospheric phenomenon consisting of bands, curtains, or streamers of light, usually green, red, or yellow, that move across the sky in polar regions. It is caused by collisions between air molecules and charged particles from the sun that are trapped in the earth's magnetic field 极光
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