noun🔗Share百万分率，百万分之。 (initialism) (common) Parts per million. (10000 ppm = 1%)"The air quality report showed a carbon monoxide level of 50 ppm, which is considered safe. "空气质量报告显示一氧化碳含量为50ppm，也就是百万分之五十，这被认为是安全的。chemistryamountunitnumberscienceChat with AIVocabulary GamePractice Reading
noun🔗Share页每分钟，每分钟页数 (initialism) page(s) per minute"The printer's specifications state it can print 20 ppm in black and white. "这台打印机的参数表明，它的黑白打印速度能达到每分钟20页 (yè mǐnzhōng 20 yè)。technologycomputingelectronicsmachineChat with AIVocabulary GamePractice Reading
