英语词汇“yolk sac”是什么意思，“yolk sac”的读音、用法及例句翻译-烛光网

词汇	yolk sac
释义	yolk sacn.（名词） A membranous sac attached to an embryo, providing early nourishment in the form of yolk in bony fishes, sharks, reptiles, birds, and primitive mammals and functioning as the circulatory system of the human embryo before internal circulation begins.卵黄囊：一种附在胚胎上的薄膜囊，在硬骨鱼、鲨、爬行动物、鸟类和原始哺乳动物内以卵黄的形式提供早期营养物，在内部循环开始之前，作为人类胚胎的循环系统
随便看	pronto pronucleus pronunciamento pronunciamentoes pronunciamentos pronunciation pronunciations pronunciation spelling prooestrum prooestrus proof proof proofed proofing proof-of-purchase proof of the pudding proofread proofs proof sheet proofs-of-purchase proof spirit prop prop prop- prop.

烛光网英语在线翻译词典收录了166908条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。