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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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

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

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?