Indeed, some sort of enrichment on Iranian soil may be essential to a negotiated deal, argues Mark Fitzpatrick of London's International Institute for Strategic Studies.

伦敦国际关系研究院的马克表示，伊朗进行的某种浓缩活动对于协商的确是有必要的。

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Iran has so far rejected the deal proposing instead that the enrichment and conversion take place on Iranian soil.

到目前为止，伊朗拒绝接受这项交易，而是提出在伊朗境内进行浓缩和转换。

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Oxalic acid , citric acid, EDTA can activate soil heavy metals and promote heavy metals element enrichment in E.

草酸、柠檬酸、EDTA能有效活化土壤重金属，促进重金属元素在海洲香薷中的富集；

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Indeed, some sort of enrichment on Iranian soil may be essential to a negotiated deal, argues Mark Fitzpatrick of London's International Institute for Strategic Studies.

ECONOMIST: Diplomacy and Iran

Ms. CONDOLEEZZA RICE (Secretary of State): I think the United States has been very clear that enrichment and reprocessing on Iranian soil is not acceptable because of the proliferation risk.

NPR: Iran's Nuclear Demands Strain U.S.-Russian Ties