In addition, over time, regular exercise will make your blood vessels become more flexible allowing them to deliver more oxygenrich blood more efficiently.
另外,久而久之,定期的运动将使你的血管更有效率、更灵活地更传送更多富氧的血液。
2
Two arteries and one vein connect the fetus to the placenta re-circulating oxygen-rich blood and nutrients and keeping your blood separate from your baby's.
Two arteries and one vein connect the fetus to the placenta, re-circulating oxygen-rich blood and nutrients and keeping your blood separate from your baby’s.