名词
中文翻译：卵黄囊
同义词：
['yolk sac', 'yolk sac remnant', 'yolk sac remnant tissue']
例句：
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1. The embryonic stage of the chicken is characterized by a large protruding yolk sac.
鸡的胚胎阶段以一个突出的卵黄囊为特征。
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2. During the development of the fetus, the yolk sac gradually shrinks and eventually disappears.
胎儿发育过程中，卵黄囊逐渐缩小并最终消失。
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3. The yolk sac contains nutrients that are essential for the growth and development of the embryo.
卵黄囊中含有对胚胎生长和发育至关重要的营养物质。