中肋是指叶片中部形成的一分化细胞群，类似于维管植物的叶脉。
各种矿质元素在不同叶位以及同叶位的中肋和软叶中的分配均有所不同。
The distribution of mineral nutrient elements was different in different leaf position, main leaf veins and soft leaves.
分别测量了离析后叶中肋细胞的长度、宽度和细胞壁厚度及纹孔场数目。
The length and width of cells, the thickness of cell walls and numbers of pit fields of the leaf costa were measured.
根据某人15年前在对练中肋部被击伤的情况来看，我得告诉你：那太疼了！
As someone who's suffered a rib cartilage injury (from a body shot in sparring almost 15 years ago) I can tell you that it's very painful.
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