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 | Từ điển Oxford Learners Wordfinder Dictionary 
 
	
		|  elves 
 
 an acronym for emissions of light and very low frequency perturbations due to electromagnetic pulse sources;
 extremely bright extremely short (less than a msec) electrical flashes forming a huge ring (up to 400 km diameter) in the ionosphere
 • Hypernyms:
 atmospheric electricity
 
 
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