字典網>> 英漢字典>> Y開頭詞條>>yolk bag的意思 漢英字典yolk bag中文翻譯：卵黃囊 相關詞條：yolk yolk sac yolk stalk yolk sac antigcns yolk-sac placenta yolky yolk endoderm yolk blastopore yolk cavity yolk cells cleavage