名词
中文翻译：封闭安全区同义词
同义词：
['closed area', 'secure zone']
例句：
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1. The closed security zone is off-limits to all outsiders.
这个封闭的安全区对所有外来者都是禁止进入的。
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2. The police closed the area to prevent any further incidents.
警方封锁了该区域以防止任何进一步的事件。
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3. The closed security zone has been thoroughly searched by the authorities.
该封闭安全区已被当局彻底搜查。