英文釋義
a vascular fetal membrane of reptiles, birds, and mammals that is formed as a pouch from the hindgut and that in placental mammals is intimately associated with the chorion in formation of the placenta
例句 Example
Changes of ureide, allantoin , allantoic acid content and al - lantoinase activity in adzuki bean ( Vigna angularis ) seedlings were investigated.
赤豆 種子萌發過程中,幼苗迅速閤成酰脲,在酰脲含量達到最大值前,尿囊酸含量高於尿囊素含量,子葉閤成酰脲最迅速;酰脲含量達到最大值後,莖帶葉的酰脲含量最高.