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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 卵黃囊 [ㄌㄨㄢˇ ㄏㄨㄤˊ ㄋㄤˊ; luan3 huang2 nang2]
 yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)