... 十亿分之 ppb 十亿分之几 ppb parts per billion 十亿分之几级 parts per billion range ...
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The Breast Cancer Fund collected 2 samples of 6 different types of food marketed to children, and found levels of BPA ranging from 21 parts per billion (PPB) to 77.5 PPB, with an average of 49 PPB.
乳腺癌基金会选取了六种面向儿童市场的食物，并各抽取了两个样本进行研究。研究结果发现这些食物中双酚含量范围为十亿分之二十一到十亿分之七十七点五，平均含量为十亿分之四十九。
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In 2011, concentrations reached a new high of 1813 parts per billion (ppb), 259% higher than pre-industrial levels.
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