求翻译：The contents of residual fractions, Fe–Mn oxide fractions for Pb, Zn, Cu and Cd and exchangeable fractions for Pb and Zn also consistently decreased是什么意思？

待解决

悬赏分：1 - 离问题结束还有

The contents of residual fractions, Fe–Mn oxide fractions for Pb, Zn, Cu and Cd and exchangeable fractions for Pb and Zn also consistently decreased

问题补充：

匿名	2013-05-23 12:21:38 剩余分数，铁锰氧化物组分对铅，锌，铜，镉和铅和锌也一直下降的可交换分数的内容

匿名	2013-05-23 12:23:18 正在翻译，请等待...

匿名	2013-05-23 12:24:58 残余的分数、FeMn氧化物分数内容为铅，锌、Cu和CD和可兑换的分数为一贯地也减少的铅和锌

匿名	2013-05-23 12:26:38 剩余分数、 Fe–Mn 氧化组分的铅、锌、铜、镉和铅和锌的可交换馏分的内容也一直下跌

匿名	2013-05-23 12:28:18

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