名词中文翻译1
中文翻译：Unknown
同义词：
['outer layer', 'epidermis', 'outermost layer']
例句：
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1. The embryonic development of the chicken is divided into three stages: ectoderm, mesoderm, and endoderm.
鸡胚胎发育分为三个阶段：外胚层、中胚层和内胚层。
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2. The outer layer of the skin provides protection against external factors such as dust and bacteria.
皮肤的外层能够抵御灰尘和细菌等外界因素。
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3.The outer layer of the skin also contains sweat glands that help regulate body temperature.
皮肤的外层还含有汗腺，有助于调节体温。