First, the weapons should be intended for use only in retaliation after a nuclear attack. Second, the possession of the weapons must be a temporary expedient.
首先，这些武器应当只在遭受核袭击后反击时才使用。其次，这些武器的拥有必须是一种临时的应急手段。
President Barack Obama told delegates Tuesday that the risk of a nuclear attack has risen.
奥巴马对星期二前来的代表们说，核袭击的风险已经在上升。
In 2006, his colleague Matthew Bunn created a mathematical model predicting a 29 percent probability of a nuclear attack in the next 10 years.
2006年，他的同事马修·邦恩创建了一个数学模型，以此预测出未来10年核攻击概率为29%。
Sagan makes the point that the most dangerous collision facing us now, however, is one that might be mistaken for something else: a nuclear attack.
萨根阐述的观点是目前我们面临的最危险的是碰撞而非人们误解的核战。
Russia's Nerpa nuclear attack submarine, damaged in a fatal accident during tests in November last year, has successfully passed final trials, a Pacific Fleet spokesman said on Monday.
俄罗斯太平洋舰队发言人周一表示，在去年11月测试中遭遇死亡事故的Nerpa攻击型核潜艇已经成功通过了最后的测试审核。
Two decades after the end of the Cold War, we face a cruel irony of history - the risk of a nuclear confrontation between nations has gone down, but the risk of nuclear attack has gone up.
在冷战结束20年后，我们面对一个残酷讽刺的历史——国家之间发生核对抗的风险下降了，但核攻击的危险却上升了。
Supporters of the Star Wars defense system hope that this would not only protect a nation against an actual nuclear attack, but would be enough of a threat to keep a nuclear war from ever happening.
星球大战防御绻统的支持者们希望它不仅能保护一个遭受核攻击的国家，也希望它能成为使核攻击游不发生的足够威胁。
Supporters of the Star Wars defense system hope that this would not only protect a nationagainst an actual nuclear attack, but would be enough of a threat to keep a nuclear war fromever happening.
星球大战防御系统的支持者们希望它不仅能保护一个遭受核攻击的国家，也希望它能成为使核攻击永不发生的足够威胁。
Supporters of the Star Wars defense system hope that this would not only protect a nation against an actual nuclear attack, but would be enough of a threat to keep a nuclear war from ever happening.
星球大战防御系统的支持者们希望它不仅能保护一个遭受核攻击的国家，也希望它能成为使核攻击永不发生的足够威胁。
The past fortnight has witnessed an unprecedented, open public debate in the Israeli media about whether, and when, to attack Iran's nuclear installations.
过去两个星期，以色列媒体在是否袭击、何时袭击伊朗核设施的问题上爆发了一场前所未有的公开辩论。
JACK BAUER famously does whatever it takes to save America from disaster, be that disaster nuclear, biological or computer attack.
JACKBAUER以拯救美国于各式灾难而闻名于世，不论这些灾难是核泄漏，生化危机还是计算机攻击。
American carriers travel with an unseen companion: at least one nuclear-powered attack submarine.
美国航母有水下隐形群组伴随：至少一艘核动力攻击潜艇。
This apparently walks back from a Bush-era declaration that underscored the possibility that the United States might use nuclear weapons if it suffered a chemical or biological attack.
这显然是走回布什时代的宣言，强调了美国可能会使用核武器如果它受到了化学或生物武器的袭击的可能性。
So, before I begin the counter-attack, here's what I didn't say about nuclear power.
所以，在我开始反击之前，这里是关于核能的一些我没有说过的东西。
Security experts widely believe that the worm was built as part of a state-backed attack on Iran's nuclear program.
安全专家们普遍认为病毒是国家背后支持攻击伊朗核计划的一部分。
The PLA Navy operates five Type 091 (NATO codename: Han class) nuclear-powered attack submarines built by Huludao Shipyard in Liaoning Province between 1967 and 1990.
中国人民解放军（PLA）海军操作的五艘091型（北约代号：汉级）核动力攻击潜艇在1967年至1990年之间由辽宁省的葫芦岛造船厂建造。
A u. s. navy nuclear-powered attack submarine under heavy escort has arrived back at its home port of Guam after a fatal accident at sea.
美国旧金山号核动力攻击潜艇在发生致命事故以后，在严密的护航之下返回在关岛的基地。
Opponents of Star Wars are worried that a system might introduce nuclear weapons into outer space and might not completely protect the nation against attack.
反对星球大战的人们担心，这个系统可能会把核武器引入外层空间，而且不可能完全使国家免受核攻击。
Opponents of Star Wars are worried that a system might introduce nuclear weapons into outer space and might not completely protect the nation against attack.
反对星球大战的人们担心，这个系统可能会把核武器引入外层空间，而且不可能完全使国家免受核攻击。
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