名词
中文翻译：卵黄囊外胚层
同义词：
['extraembryonic mesoderm', 'extraembryonic endoderm']
例句：
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1. The extraembryonic mesoderm is the first tissue to form after fertilization.
受精后形成的外胚层是第一个形成的组织。
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2. The extraembryonic endoderm is responsible for the formation of the digestive system.
外胚层负责形成消化系统。
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3. The extraembryonic mesoderm and endoderm are important in the development of the embryo.
外胚层和内胚层在胚胎发育中起着重要作用。