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来源：雅诚德英语网
The dorsal epidermis had three layers of cells at the 34th day of incubation. Pigmentation started to appear in the cells of periderm at the 40th day of incubation.
背部表皮在孵化第34天出现三层细胞，第40天周皮层细胞中开始出现色素沉集。
The dorsal epidermis had three layers of cells at the 34th day of incubation. Pigmentation started to appear in the cells of periderm at the 40th day of incubation.
背部表皮在孵化第34天出现三层细胞，第40天周皮层细胞中开始出现色素沉集。