短語詞組短語Gestational sac puncture 孕囊穿刺術(shù)gestational sac diameter 孕囊直逕GS Gestational Sac 妊娠囊GESTATIONAL SAC CHARACTERISTICS 胎囊特征lagged development of gestational sac 孕囊發(fā)育延緩 返回 gestational sac