US President Bush will soon give Russia notice that the United States is withdrawing from the 1972 nucleartreaty that bans testing of missile defense systems.

美国总统布什将很快通知俄罗斯，美国将退出1972年禁止测试导弹防御系统的核条约。

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US President Bush will soon give Russia notice that the United States is withdrawing from the 1972 nuclear treaty that bans testing of missile defense systems.

美国总统布什将很快通知俄罗斯，美国将退出1972年禁止测试导弹防御系统的核条约。

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They are used for everything from ordering a pizza to running hospitals and military defense systems.

从订购比萨饼到管理医院及军事防御系统，计算机的使用范围广及各个层面。

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The researchers found that PQQ is important in the reproductive and defense systems of mice.

VOA: special.2009.04.21

U.S.government and military officials are working on better cyber-defense systems and trying to coordinate efforts.

VOA: standard.2009.08.11

"The reductions in this treaty will not affect the strength of our nuclear triad, nor does this treaty limit plans to protect the U.S.and our allies by improving and deploying missile defense systems."

VOA: standard.2010.03.26

Russia also reportedly has sold six S-300 air defense systems to Syria under a 2010 contract.

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Defense Secretary Donald Rumsfeld ordered air defense systems around Washington armed with anti-aircraft missiles Tuesday.

CNN: U.S. at 'high alert' on anniversary of 9/11

When President Obama campaigned last year, he said that he supported missile defense systems that work.

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