Infrared radiation protection wall. 24-hour security patrol.

红外对射围墙防护。24小时保安巡逻。

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Implement the school is in charge of the leadership responsibility system, strengthen the campus food hygiene security patrol, urged, inspection.

实行学校分管领导负责制，切实加强校园食品卫生安全的巡视、督促、检查力度。

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The trio were working with special forces carrying out a routine security patrol with Afghan forces when their vehicle was struck by a bomb blast and came under small arms fire.

遇袭时，这三人正与特种部队成员及阿安全部队执行例行的巡逻任务，他们乘坐的车辆遭爆炸袭击后受到轻武器火力攻击。

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In past decades, schools have installed metal detectors, hired extra security to patrol grounds and hallways and instituted other zero-tolerance measures to make campuses safer.

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Hofstra's president, Stuart Rabinowitz, issued a statement Wednesday saying security workers already patrol the neighborhood.

WSJ: Hofstra petition seeks better off-campus security

In addition, the terrain is incredibly difficult for any police or security force to patrol or defend.

NPR: Suicide Bombers Hit International Force in Sinai