Note:PPM means partpermillion, usually a measure of quality.
注:PPM是百万分之一件的缩写,通常是质量的一种指标。
2
The process USES small amounts of the naturally occurring mineral to increase concentrations to no more than one partpermillion typically.
这一过程应用了少量的自然出现的矿物质去增加浓度,不超过百万分之一。
3
The agency said it had determined that levels of melamine or one of its related compounds, alone, below 1 partpermillion in infant formula were not a concern.