(noun.) cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins.
(noun.) any of the stiff bony spines in the fin of a fish.
(noun.) a branch of an umbel or an umbelliform inflorescence.
(noun.) (mathematics) a straight line extending from a point.
(verb.) emit as rays; 'That tower rays a laser beam for miles across the sky'.
手打:肖恩
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