The concentration< of acid in these products is so low that our digestive systems are easily capable of coping with it with no harm to us.

这些产品的酸浓度非常低，我们的消化系统很容易就能处理它们，不会对我们造成任何伤害。

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So water-retaining agents could mix urea and low concentration potassium in process of production, and we can study complex water-retaining agents which compose the nitrogen and potassium too.

因此，在生产过程中可以考虑保水剂与尿素和低浓度的钾肥混合施用，也可以进行赋氮肥、钾肥的复合型保水剂研究。

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The volatile organic compound (VOCs) with low concentration but high toxicity will pollute atmosphere and causes so-called "Sickly Building Syndrome" (SBS), and imperil heavily the health of people.

低浓度、高毒性的挥发性有机化合物(VOC)污染大气，造成“病态建筑综合症(SBS)”，严重威胁着人们的身体健康。

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