noun 下载 🔗分享 肋骨，排骨 A rib. Examples : "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。 anatomy physiology body part organ 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 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. Examples : "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。 biology anatomy plant animal insect part organism structure 与AI对话词汇游戏阅读练习
