| 单词 | ppm |
| 释义 | ppm ppm // abbr part(s) per million
1 (Technical ) a measurement of how much of a substance a liquid or other substance contains: air with 50 ppm nitrogen dioxide
2 (Production ) a measurement of how efficient a manufacturing process is, which records the number of defects (= faults in the way sth has been made) found in each million parts produced: We aim for a quality level of 3ppm in our production line. |
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