costa的復數形
costae See {costa} costa n 1: a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing) 2: any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) [syn: {rib}] [also: {costae} (pl)]