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。

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，像手指伸富母血池中。

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

在整个小肠肠壁上有数百万微小微观结构称为绒毛（绒毛）。

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

通过绒毛中毛细血管被完全消化营养物质进血液和淋巴管。

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。

Now, despite its name, the small intestine can be as long as 10.5 meters or about 35 feet, with lots of tiny ridges and grooves, each of which projects little finger-like fibers called villi.

虽然名字叫“小”肠，小肠却并不小；它最长可达10.5米（35英尺）；肠壁上还有大量沟脊（环形皱襞），皱襞上有许多突出指状结构称为绒毛。

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“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组织，富微小胎儿动脉和静脉。