血液中CO普通含量相当低——零至百万分之八。
A normal amount of CO in your blood is extremely low — zero to eight parts per million.
意味着,二者之间的差别仅是,百万分之三分之一。
That means the difference between the two is only one-third % of a millionth of a percent.
希望将大气中二氧化碳含量由百万分之380降低到百万分之350。
Want concentration of CO2 in atmosphere lowered from 380 to 350 parts per million.
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