So according to the passivation effect on available forms of heavy metals, fly ash, phosphorate rock and peat are effective passivation reagents, and the appropriate proportion of addition is respectively 20%,15% and 10% (FA20, PR15, PT10).是什么意思_So according to the passivation effect on available forms of heavy metals, fly ash, phosphorate rock and peat are effective passivation reagents, and the appropriate proportion of addition is respectively 20%,15% and 10% (FA20, PR15, PT10).在线翻译_英语_读音_用法_例句