Also, this kind of qualitative detecting method for nitrate can be applied in the initial enrichment system of freshwater nitrite-oxidizing bacteria.

该方法亦适用于淡水亚硝酸氧化细菌初始富集培养过程中硝酸盐的定性检测。

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In the way enrichment works, getting from 20% to bomb-usable 90% enrichment takes a lot less effort even than churning out the initial 3.5% reactor-grade stuff still piling up at Natanz.

走浓缩这条路，从20%到可用作造核弹的90%的浓缩所要花费的努力甚至比艰苦地做出开始的3.5%浓度的反应堆物质要少的多。 在纳坦兹，伊朗依然在生产3.5%浓度的浓缩铀。

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The initial deal should trade suspension of enrichment for suspension of sanctions.

最初的协议应该以暂停浓缩活动换取暂停经济制裁。

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Ali Velayati, who was foreign minister from 1981-97, and remains a top adviser to Iran's Supreme Leader, Ayatollah Ali Khamenei, has publicly declared that Iran should accept the proposal, which calls for an initial six-week period of preliminary talks, during which Iran would forego any expansion of its enrichment programme in exchange for a freeze on new sanctions.

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