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词汇 gestational sac
释义 gestational sac
基本例句
胎囊
It involves removing a small amount of tissue called the chorionic villi, which is located on the outside of the fetalgestational sacand 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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