| 单词 | 尿囊 |
| 释义 | 〔chorioallantois〕The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.绒毛膜尿囊：由融合的绒毛膜和尿囊组成的富含血管的胎膜组织，存在于爬行类动物和鸟类的蛋壳附近，并且构成大多数哺乳动物的胎盘 |
| 随便看 |
|
学习网英语词汇栏目收词371507余条，连同派生词、复合词、词组和习语等。每个词条提供了音标、词性、释义、用法、搭配和同（近）义词等多项功能，对所收词汇进行全方位的解释和说明，内容丰富，功能全面。