名词
中文翻译：警戒空间
同义词：
['protective space', 'security space例句：1. The guard space is designed to keep out intruders.（警戒空间的设计是为了阻止入侵者。）']
例句：
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1. The guard space is designed to keep out intruders.
警戒空间的设计是为了阻止入侵者。
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2. The security guard patrolled the area during the night.
保安在夜间巡逻该区域。
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3. The military has been using this space for years to protect its borders.
军方多年来一直使用这个空间来保护其边境。