以下为句子列表：
英文: A painless pulse of electricity can drive drugs, which tend to be charged, through the impermeable outer layer of the epidermis and into the blood vessels of the dermis.
中文: 无痛的电流脉冲可以趋使药物（通常会带电荷）穿越不通透的表皮外层，进入真皮层的血管。
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英文: An outer layer or coating applied to a surface for protection or decoration.
中文: 饰面，保护面装在外面的外层或薄层，为了保护或装饰
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英文: Outer layer such as cornea serves a role to reflect the images.
中文: 外层，比如角膜可以起到反光的作用。
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英文: The outer layer of an internal organ or body structure, as of the kidney or adrenal gland.
中文: 皮层内部器官或身体结构的外层，如肾或肾上腺皮层
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英文: The outer layer of the barbules consists of a two-dimensional crystal framework made of melanin rods connected by keratin — a fibrous protein — in a lattice pattern.
中文: 外层的小羽枝由一个二维的结晶状结构组成，由黑色素杆状细胞构成，与角蛋白相连——一种纤维状蛋白质——在一种格子式样图案里面。
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