If somebody knows you have a nuclear weapon in your house, they're going to think twice about breaking in.

如果知道你家里有核武器，他们在破门而入之前肯定会再三考虑。

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They know that they will be treated differently if they can prove they have a nuclear weapon.

他们知道如果能证明自己拥有核威慑力，整个世界就会用另一种态度来对待他们。

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They have done nothing to reassure the international community that they are prepared to comply with the NPT or stop their progress toward a nuclear weapon.

他说：“他们没有做出任何行动来向国际社会保证他们将遵循《不扩散核武器条约》，或者他们会停止制造核武器的进程。”

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"As the only nuclear power to have used a nuclear weapon, the United States has a moral responsibility to act.

VOA: special.2009.04.11

Western nations are concerned that Iran could use the missile technology to launch a nuclear weapon, which Iran is suspected of building.

VOA: special.2009.02.07

The president said groups like al-Qaida would surely use a nuclear weapon if they got one.

VOA: special.2010.04.17

The world has gone over sixty years without another detonation of a nuclear weapon in warfare.

CENTERFORSECURITYPOLICY: A Nuclear Iran: The Case for Action

He will take every action necessary to ensure that Iran does not acquire a nuclear weapon.

WHITEHOUSE: The White House

Indeed, the entire world has an interest in preventing Iran from acquiring a nuclear weapon.

WHITEHOUSE: President Obama at 2012 AIPAC Policy Conference