美国的细菌数量上限是每毫升水不超过500个菌落形成单位。

The U.S. bacterial limit is no more than 500 colony-forming units of bacteria per milliliter of water.

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报道用生物发光技术（BL法）取代现行卡介苗菌落形成单位计数法（CFU）的实验研究。

This paper reports our investigation of the possibility of the ultiliza- tion of the Bioluminesceht (BL) technique to substitute the traditional viability count of CFU of current BCG vaccine.

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