These villi push into the decidua basilis, like tiny fingers reaching into a warm pool of oxygen-rich maternal blood.

这些绒毛伸进基蜕膜内，像手指伸入温暖的氧含丰富的母血池中。

And in turn, each villus is covered in teeny tiny little microvilli.

每个绒毛上又分布有大量微小的微绒毛。

This can also be done prenatally by testing fetal DNA obtained through either chorionic villus sampling or amniocentesis.

这可以在产前通过检测胎儿DNA完成，如绒毛膜绒毛取样或羊膜穿刺术。

In the wall of the entire small intestine are millions of tiny, microscopic projections called villi (villus).

在整个小肠的肠壁上有数百万微小的微观的结构称为绒毛（绒毛）。

Another example can be found in your small intestine, where structures called villi fold up into little fingers.

另一个例子可以在你的小肠中找到，称为绒毛的结构折叠成小指。

It is through the capillaries in the villi that completely digested nutrients pass into the bloodstream and lymph vessels.

通过绒毛中的毛细血管被完全消化的营养物质进入血液和淋巴管。

Gases and nutrients move back and forth between the decidua basalis and the fetal veins, by diffusing through the tissue layer of the thin chorionic villi.

气体和营养物质通过在薄绒膜绒毛组织层之间扩散，在基蜕膜和胎儿静脉之间来回移动。

Each villus is made of cells with highly folded membranes that have tiny bumps called microvilli to increase their surface area.

每个绒毛都由具有高度折叠膜的细胞组成，这些膜具有称为微绒毛的微小凸起以增加它们的表面积。

This happens in the small intestine's lower regions, the jejunum and ileum, which are coated in millions of tiny projections called villi.

这发生在小肠的下部区域，即空肠和回肠，它们被数百万个称为绒毛的微小突起覆盖。

The fetal layer of the placenta on the other hand is called the chorion, which is a tissue that has fingerlike projections called chorionic villi which contain tiny fetal arterioles and venules.

胎盘的“胎儿层”也被称为绒毛膜；这是一种有绒毛膜绒毛这种手指状突起的组织，富含微小的胎儿动脉和静脉。