名词
中文翻译：囊胚
同义词：
['blastocyst', 'yolk sac']
例句：
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1. The coelogastrula is the first stage of development in a developing embryo.
囊胚是胚胎发育的第一阶段。
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2. During the coelogastrula stage, the embryo is surrounded by fluid and protected by the yolk sac.
在囊胚阶段，胚胎被液体包围，由卵黄囊保护。
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3. Researchers are studying the coelogastrula to understand how it affects early brain development.
研究人员正在研究囊胚，以了解它如何影响早期大脑发育。