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n.肋；缘；中脉；前缘脉 变形： 复数：costae 英英释义： costa[ 'kɔstə ]n.a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing)any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in h
