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工程设计中经常发现一些使用错误或不当的计量单位出现在设计文件、科技书刊甚至标准中 ,影响对原文含义的理解。ｐｐｍ和 ｐｐｂｐｐｍ是ｐａｒｔｓｐｅｒｍｉｌｌｉｏｎ的缩写 ,意为百万分之（几）或百万分率。而 ｐｐｂ是 ｐａｒｔｓｐｅｒｂｉｌｌｉｏｎ的缩写。ｂｉｌｌｉ
Often found in engineering design errors or improper use of units of measurement appear in the design documents, books and even technical standards, affecting the understanding of the original meaning. ppm and ppbppm are acronyms for partspermillion, meaning parts per million (parts) or parts per million. Ppb is an acronym for partsperbillion. billi