单词retroposition
网络: 后移；逆转座；逆转录转座
Labor characteristics and treatment methods for birth difficulty due to retroposition of fetal head
胎头高直后位难产的产程特点及处理方法
Retroposition in Plant Gene Origination and Genomes Evolution
逆转座在植物基因起源和基因组进化中的作用
retroposition (latero-location, ptosis) of uterus
子宫后位（侧位，下垂）