But he said there had been no leakage of radiation or radioactive material from nuclear facilities.

但是他说，并没有辐射或放射性物质从核设施中泄漏。

youdao

We think it might be underestimating the tenacity of those who would seek nuclear material for a weapon.

我们认为这可能低估了那些寻求核原料制造武器的人的坚韧程度。

youdao

That is more than enough time to divert nuclear material and make mischief with it.

这么长的时间足够转移核原料并用以进行破坏了。

youdao

"I am announcing a new international effort to secure all vulnerable nuclear material around the world within four years."

VOA: standard.2010.04.06

But experts say no-one knows how large the world stockpile of nuclear material is because not every country reports what it's producing.

VOA: standard.2010.04.06

Uranium enrichment is the process used to make fuel for nuclear power plants, but when extended it can also produce fissile material for an atomic bomb.

VOA: standard.2009.11.28

It presents a threat not only to our friends, but ultimately a threat to us to have Iran have nuclear material, nuclear weapons that could be used against us or used to be threatening to us.

WHITEHOUSE: The White House

"The Agency is unable to provide credible assurance about the absence of undeclared nuclear material and activities in Iran, and therefore to conclude that all nuclear material in Iran is in peaceful activities, " the IAEA concluded.

CNN: STORY HIGHLIGHTS

The President outlined with President Sarkozy and Prime Minister Brown at the G20 an effort by the Iranians to go around the IAEA in a clandestine effort that many presumed was to create nuclear material for a nuclear weapon.

WHITEHOUSE: Press Briefings