The maternal layer, the decidua basalis, is literally a flattened out bag of blood with uterine arteries delivering blood in and uterine veins pulling blood out.
所谓“母体层”，即基蜕膜，就是一个平整的血袋，将子宫动脉的血输送进去。
Uterine veins
原声例句
Osmosis-生殖
英语百科
Uterine veins
The uterine veins are tributaries of the internal iliac veins. They are found in the cardinal ligaments.
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