名词
中文翻译：外胚层
同义词：
['outer layer', 'outer epidermis']
例句：
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1.The ectoderm is the first layer of cells that forms the body's outermost skin.
外胚层是形成身体最外层皮肤的第一层细胞。
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2.During embryonic development, the ectoderm cells form the structures that will eventually become the brain and spinal cord.
在胚胎发育过程中，外胚层细胞形成最终将变成大脑和脊髓的结构。
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3.The ectoderm layer is responsible for providing the body with a protective barrier against infection.
外胚层层负责为身体提供对感染的防护屏障。