A doctor can check this for you; you can also monitor it yourself using a finger pulse oximeter, available in medicalsupply stores.
医生可以作这项检查。也可以自己用指尖脉博血氧仪来自行监测血氧含量，该血氧仪在医药用品商店有售。
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I grew up in a small town in the middle of Minnesota and my father was a traveling medicalsupply salesman. Happenstance led me into the medical business.