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，像手指伸入温暖氧含丰富母血池。

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).

在整个小壁上有数百万微小微观结构称为绒毛（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小到，称为绒毛结构折叠成小指。

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

通过绒毛毛细血管被完全消化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细胞组成，这些膜具有称为微绒毛微小凸起以增加它们表面积。

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

这发生在小下部区域，即空和回，它们被数百万个称为绒毛微小突起覆盖。

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“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，富含微小胎儿动脉和静脉。

These folds are lined with tiny hair-like villi and even tinier microvilli, which create a truly impressive surface area — large enough that, if it were unfolded, it would cover a tennis court.

这些褶皱内衬着微小毛发状绒毛，甚至更小微绒毛，这创造了一个真正令人印象深刻表面积——足够大，如果展开，它将覆盖一个网球场。

By analyzing the villi that provide contact with the mother's blood to the fetal membrane, Muneta deduced that the fetus must be living in an environment of elevated ketones from the start of pregnancy.

通过分析在母体血液和胎膜之间起着纽带作用绒毛，Muneta 推导出，在母体受孕之，初胎儿便生活在一个酮体水平较高环境。