In addition, over time, regular exercise will make your blood vessels become more flexible allowing them to deliver more oxygen rich 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。

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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.

两个动脉和一个静脉把胎儿与胎盘联结在一起，传递富含氧气和营养的血液，并把你的血液与婴儿自己的血液分离开。

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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.

两个动脉和一个静脉把胎儿与胎盘联结在一起，传递富含氧气和营养的血液，并把你的血液与婴儿自己的血液分离开。

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Chalk streams in the Lincolnshire Wolds are shallow, clear and oxygen rich, supporting a wide variety of plants and wildlife, including the water vole.

BBC: Lincolnshire project restores water vole streams

These free radicals are oxygen-rich molecules in which one of the oxygen atoms is particularly likely to react with other chemicals.

ECONOMIST: Trojan DNA

Much of the damage looks like the result of oxidation by free radicals (oxygen-rich compounds released during cellular energy production).

ECONOMIST: Disposing of dementia | The