卵黄囊
yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)
Frequency 2.4
Meanings
- yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)
yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)
Frequency 2.4