Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.

对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。

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In these cases, a test revealing low blood oxygen may alert doctors.

在这种病例中，医生就需要注意检测病人是否有低血氧的症状。

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Poor blood oxygen levels and blood vessel blockages in people with sickle-cell disease can lead to chronic acute pain syndromes, severe bacterial infections, and necrosis (tissue death).

镰状细胞病患者血液含氧量低并且发生血管堵塞，可导致出现慢性和急性疼痛综合症、重度细菌感染和坏疽(组织坏死)。

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Blood clots can kill if they move to the heart and lungs and stop needed oxygen from reaching those important organs.

VOA: special.2009.07.14

The way, in the simplest terms that cyanide can kill you, is it basically out-competes your oxygen for the heme in your blood.

氰化物可以杀掉你的最简单的一种方式基本上就是，将氧从你血液中,的血红素中挤出去。

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Some of them have the capability of becoming red blood cells which carry oxygen in the blood.

一些能够成为红细胞,红细胞是血中携氧的细胞

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