The number of chondrocytes increased , and the volume was expanded in group B20 or B40 , the degenerating chondrocytes were not found in the same group .
B20组及B40组细胞数量增多且胞体增大，有较多同源软骨细胞群，无退变细胞。
B40 is middle-aged.40 is old !
B40岁是中年。40岁的人老了！
b40