chorionic villus

例句：

1. 1. The fetus is surrounded by achorionic villus that provides nutrientsand oxygen to the developing baby.
   胎儿被绒毛膜绒毛包围，为发育中的婴儿提供营养和氧气。
2. 2. Duringpregnancy, the chorionic villus grows thickerand thicker, providing more protectionfor the developing fetus.
   怀孕过程中，绒毛膜绒毛逐渐增厚，为发育中的胎儿提供更多保护。
3. 3. Thechorionic villusplays a crucial role in thedevelopment of the fetus, asit provides essential nutrients and oxygen.
   绒毛膜绒毛在胎儿发育中起着至关重要的作用，因为它提供了必需的营养物质和氧气。