1. A membranous sac that develops from the posterior part of the alimentary canal in the embryos of mammals, birds, and reptiles. It is important in the formation of the umbilical cord and placenta in mammals. 
   尿模哺乳动物、鸟类和两栖动物的胚胎中在消化道后部形成的膜质液囊。对哺乳动物脐带和胎盘的形成有重要作用
2. history of Suez Canal 
   苏伊士运河史
3. laceration of birth canal 
   软产道损伤
4. seepage control of canal 
   渠道防渗
5. Subei General Irrigation Canal 
   苏北灌溉总渠

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