noun🔗Share肋骨，排骨 A rib."The doctor pointed to the costa on the X-ray, explaining that it was fractured. "医生指着X光片上的肋骨，解释说它骨折了。anatomyphysiologybodypartorganChat with AIVocabulary GamePractice Reading
noun🔗Share叶脉，肋脉。 A riblike part of a plant or animal, such as a middle rib of a leaf or a thickened vein or the margin of an insect wing."The teacher pointed to the leaf and explained how the costa, the central vein, provides support and carries water to the entire leaf. "老师指着叶子解释说，主叶脉，也就是中间的那条粗叶脉，如何为整片叶子提供支撑，并且输送水分。biologyanatomyplantanimalinsectpartorganismstructureChat with AIVocabulary GamePractice Reading
