名词
中文翻译：外胚层
同义词：
['outer layer', 'epidermis例句：1. The ectophragm is the outermost layer of the embryonic chick.（外胚层是胚胎期的鸡的最外层。）']
例句：
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1. The ectophragm is the outermost layer of the embryonic chick.
外胚层是胚胎期的鸡的最外层。
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2.The ectophragm acts as a barrier between the inner and outer layers of the skin.
外胚层作为皮肤内层和外层之间的屏障。
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3.The ectophragm is responsible for forming the body's external features.
外胚层负责形成身体外部特征。