侏儒；爱恶作剧的孩子(elf的复数)
侏儒；爱恶作剧的孩子(elf的复数)
n. 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
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