Lastly the gastric mucosa is highly vascularized, which helps deliver oxygen and bicarbonate and carry away acid that makes it through into the lamina propria.

最后，胃粘膜高度血管化，这有助于输送氧气和碳氢盐并，使通有层。

One hypothesis is that the placenta implants lower down when the endometrium in the upper uterus is not well vascularized.

一个假说认为胎盘附着于子宫底部的原因是顶部的子宫内膜没有得到良好的血供。