大气层里二氧化碳含量的测量单位是ppm，即一百万体积的空气中所含二氧化碳的体积数。
The level of carbon dioxide in the atmosphere is measured in parts per million (PPM).
结果脑损伤后单位体积湿重脑组织含钙量变化不明显，钙调素含量及磷酸二脂酶活性分别在损伤后即刻及12小时明显升高。
Results The brain Ca2+ content was not change at unit volume of fresh cerebral tissue, CaM content and PDE activity rose significantly at that time and 12 hours of the brain damage.
镀液单位体积的重量是焦磷酸钾和焦磷酸铜含量的函数。
The weight of copper plating solution in a unit volume was function of contents of cupric pyrophosphate and potassium pyrophosphate.
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