胎囊

fetal sac的用法和样例：

例句

It involves removing a small amount of tissue called the chorionic villi, which is located on the outside of the fetal gestational sac and will later become the placenta.该检验将少量位于胚胎胎囊外部叫做绒毛膜绒毛的组织移除，该组织未来将成长为胎盘。

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学英语单词

absolute integrable function

autoimmune thyroiditis

autolocate

automatic recording

avosentan

axis of acoustic symmetry