胎龄22天胎兔背部皮肤已有神经纤维支配。
The skin nerve fibers were detected in the fetal rabbits at 22 days gestation.
南美洲蛙；在其背部皮肤的凹坑里培育其幼子。
South American toad; incubates its young in pits in the skin of its back.
取背部皮肤，用分光光度法测定小鼠皮肤中胶原蛋白的含量。
The contents of collagen in mice back skin were measured by photometry.
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