皮刺比刺要小了许多：它们是这些植物外层的附属物，看上去像皮肤的表皮，其下还有亚表皮层。
Prickles are smaller than thorns: they are sharp outgrowths of the plant's outer layers, the skin-like epidermis, and the sub-epidermal layer just beneath it.
最常见的皮肤癌发生于表皮(皮肤外层)，因大气中臭氧层变薄而发生频率越来越高。
The most common types arise in the epidermis (outer skin layer) and have become more frequent with the thinning of the atmosphere's ozone layer.
这些研究者们报告说，这种处理促进人类胚胎干细胞形成表皮，即皮肤的外层。
The treatment drives the human embryonic stem cells toward forming an epidermis, the outer layer of skin the researchers report.
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