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。
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。
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%。
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 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。
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。
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