| 词汇 | ppm |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | ppm noun[ U ] uk /ˌpiː.piːˈem/ us /ˌpiː.piːˈem/ abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance)百万分之…(衡量物质与液体或其他物质混合时的度量单位，parts per million的缩写） Miscellaneous units of measurement acre acreage caloric dioptre farad fathom firkin flashpoint hectare joule MHz newton refractive index röntgen Scoville scale SI unit sievert sun protection factor torr watt ppm | American Dictionaryppm noun[ U ] chemistry abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance) ppm | Business Englishppm noun[ plural ] MEASURESukus abbreviation for parts per million: the amount of a chemical in relation to the substance that contains it: Lead levels in the water were above 3,500 ppm. |
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