Form the necessity for establishing automatic command systems of important area, the status quo of important area air defense is analyzed.

从建立重点区域防空指挥自动化系统的必要性出发，分析了目前重点区域防空系统的现状。

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John Collom was a British thinker on sea power and expert on imperial defense in the 19th century. He gave the first comprehensive exposition to the necessity and importance of Britain's defense.

约翰·科洛姆是19世纪英国的海权思想家和帝国防御问题专家，他首次全面阐述了英帝国防御的必要性和重要性。

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In theory, people presently judge self-help of environmental infringement mainly according to the theories of traditional criminal law, legitimate defense in civil law and necessity.

目前理论界对于环境侵权自力救济的认定，主要适用传统刑法与民法正当防卫、紧急避险的构成理论。

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They claimed they had acted out of necessity; that was their defense.

但他们声称此行为是迫不得已;,他们这样辩护。

耶鲁公开课 - 公正课程节选

While they might disagree on how best to reduce the deficit, congressional leaders in both parties now endorse the necessity of a strong missile defense as the cheapest insurance against the tragedy of a nuclear attack on a U.S. city.

CENTERFORSECURITYPOLICY: Confronting Iran Beyond the Fiscal Cliff

Despite today's victory, the Center for Security Policy remains concerned about the inadequate attention being paid by many in Washington to the necessity of providing for a robust defense industrial base and hot production lines operated by reliable suppliers to meet America 's present and prospective war material needs.

CENTERFORSECURITYPOLICY: Victory on the C-17, but concerns remain

The survey supports this observation, in that 92 percent of respondents agree that self-defense, in order to interrupt an in-progress attack, is a necessity.

FORBES: Is Your IT Posture That Of A Protector, Detective, or Warrior?