Fearful that India's nuclear Arsenal will overwhelm its own, Pakistan continues to block negotiations on a treaty that would freeze all production of weapons-grade material.

巴基斯坦担心印度的核武库会压过其核武库，所以继续阻挠关于冻结所有武器级材料生产的条约的谈判。

youdao

"Last November,Iran announced that it would build In February, Iran said that it would begin to enrich uranium to nearly 20 percent-moving,closer to weapons-grade material."

VOA: standard.2010.06.09

The U.S.government says Tehran is trying to make weapons-grade nuclear material.

VOA: standard.2010.06.29

One reason why many people distrust nuclear power is because they believe it is impossible to separate civil reactors from weapons-grade fissile material.

BBC: Sellafield saved - for now

The U.S. and its allies are seeking to gain Iran's willingness to suspend its production of near weapons-grade nuclear material at its uranium-enrichment sites in return for economic incentives.

WSJ: Iran Says It Is Set for Nuclear Talks, but West Is Skeptical

While most are enriching below 20 percent, this material, too could be turned into weapons-grade uranium, although with greater effort than is the case for the 20-percent stockpile.

NPR: Iran Nuke Talks Open, EU Asks Tehran To Compromise