noun 下载 🔗分享 中脉，中肋. The strengthened vein down the middle of a flower petal or simple leaf or leaflet. Examples : "The botanist pointed to the long, central midrib of the maple leaf, explaining how it provides support and carries water. " 植物学家指着枫叶上那条长长的、位于中央的中脉，解释说它如何提供支撑并输送水分。 plant part biology nature structure organism 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 叶轴, 中脉。 The continuation of the petiole of a pinnately compound leaf around which the leaflets attach. Examples : "In botany class, we learned that the midrib of a rose leaf extends from the stem, and the individual leaflets are attached along its length. " 在植物学课上，我们学到玫瑰叶的叶轴/中脉从茎部延伸出来，一片片小叶就附着在它的两侧。 biology plant anatomy part structure nature 与AI对话词汇游戏阅读练习
