| 单词 | yolk sac |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔embryonic membrane〕Any of the membranous structures closely associated with or surrounding a developing vertebrate embryo, including the amnion, chorion, allantois, and yolk sac.胚膜：任何与发育中的胚胎相关或包围胚胎的膜状结构，包括衣胞、绒膜胚囊、尿膜和卵黄囊美国传统〔yolk stalk〕A narrow ductlike part that connects the yolk sac to the middle of the digestive tract of an embryo.卵黄柄：连接卵黄囊和胚胎消化道中部的狭窄的管状部分美国传统 |
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