基本解释【胚胎学】卵黄（囊）带 卵黄柄英汉例句双语例句The yolk sac and yolk stalk on one of them were well preserved.观察了三例人胚外形，其中一例还有保存良好的卵黄囊和卵黄蒂。专业释义生物学卵黄蒂卵黄柄