名词
中文翻译：外胚层
同义词：
['ectoderm', 'extraembryonic mesoderm', 'extraembryonic ectoderm']
例句：
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1. The development of the embryo is divided into three main stages: the cleavage stage, the gastrulation stage, and the ectomere formation stage.
胚胎发育分为三个主要阶段：分裂阶段、囊胚形成阶段和外胚层形成阶段。
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2. During the early stages of development, the cells in the ectomere layer are responsiblefor forming the body's external structures.
在发育的早期阶段，外胚层中的细胞负责形成身体外部的结构。
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3. Researchers have discovered that the ectomere layer plays a crucial role in the development of the nervous system.
研究人员发现外胚层在神经系统的发展中起着至关重要的作用。