That's the Frontier Defense Inspection Station.

那是边防检查站。

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The Qing Dynasty saw great changes in the traditional ideas about the frontier defense.

有清一代，传统边防的思想观念有了重大的变化。

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In the northern frontier defense of the Ming Dynasty, the disposition and use of the firearm underwent a rise and fall.

在明代北部边防中，火器的配备和使用经历了一个起伏的过程。

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When our freedoms in the networked world come under attack, the Electronic Frontier Foundation (EFF) is the first line of defense.

FORBES: Facebook's $9.5 million from Beacon lawsuit settlement should go to the Electronic Frontier Foundation

Last week, the Pentagon demonstrated for the third time in a row the inherent feasibility of recommendations insistently advanced over the past seven years by organizations like the Center for Security Policy, High Frontier and the Heritage Foundation: The U.S. Navy's Aegis fleet air defense system can be rapidly and effectively adapted to perform ant-ballistic missile missions from the sea.

CENTERFORSECURITYPOLICY: Get On With It: Time To Deploy Sea-Based Missile Defenses