Iran has come under more international pressure to respond to a proposal that it send uranium abroad for enrichment.

伊朗将铀运送到国外进行浓缩，为此伊朗正承受更多的国际压力。

The head of the UN nuclear watchdog, Mohamed ElBaradei, said the draft（草稿，汇票） deal offered last month was a "fleeting¹ opportunity" to avoid confrontation²（对审，面对）.

Iran has raised "technical and economic considerations" with the International Atomic Energy Agency (IAEA) and has missed deadlines to respond.

US Secretary of State Hillary Clinton urged Iran to accept the draft plan.

She said that Iran was at a "pivotal moment（紧要关头）".

"We urge Iran to accept the agreement as proposed. We are not changing it," she said, during a visit to Marrakesh, Morocco.

Britain, France and Russia have also called on Iran to promptly³ respond.

Under the plan brokered⁴（中介） by the IAEA and agreed by Russia, the US and France, most of Iran's enriched uranium would be sent abroad to be turned into fuel rods（燃料棒） for research use.

This is seen as a way for Iran to get the fuel it needs, while giving guarantees to the West that it will not be used for nuclear weapons.

Mr ElBaradei said that co-operation between Iran and Western powers was "primarily a matter of confidence building, which can only be achieved through dialogue."

He added: "I therefore urge Iran to be as forthcoming as possible in responding soon to my recent proposal."

The draft plan would require Iran to send about 1,200kg (2,600lb), or 70%, of its low-enriched uranium to Russia by the year's end for processing.

Subsequently, France would convert（转变） the uranium into fuel rods for use in a reactor⁵ in Tehran that produces medical isotopes⁶（同位素）.

Mr ElBaradei said the deal was a chance to "reverse course".

"The issue at stake（在危险中） remains⁷ that of mutual⁸ guarantees among the parties.

"I should add, however, that trust and confidence building are an incremental⁹（增加的） process that require focusing on the big picture and a willingness to take risks for peace.

"This is a unique and fleeting opportunity to reverse course from confrontation to co-operation and should therefore not be missed."

British Foreign Secretary David Miliband, speaking in Moscow after talks with his Russian counterpart, also appealed for a prompt answer from Tehran.

"The Iranian government can be treated as a normal country on nuclear matters if it behaves like a normal country," he said.

Iran revealed the existence of a secret nuclear facility in September.

Iran says its nuclear programme is for purely¹⁰ peaceful purposes but the revelation of the existence of the new plant, near Qom, had increased fears in the West about Tehran's intentions.

French Foreign Minister Bernard Kouchner said the Western powers would not tolerate further delays by Iran.

Iran has said it wants the UN's nuclear watchdog to establish a committee to review a deal.

Iranian Foreign Minister Manouchehr Mottaki said the country had passed a request to the IAEA two days ago to establish a commission to review the deal.

In the meantime, Mr Mottaki said, Iran would "continue enrichment" for its nuclear needs.