名词
中文翻译：警戒线
同义词：
['protective barrier', 'boundary', 'cordon', 'cordoned-off area']
例句：
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1. The police were guarding the entrance to the stadium.
警察正在守卫体育场入口。
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2. The soldiers formed a protective barrier around the wounded soldier.
士兵们在伤员周围形成了一道防护带。
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3. The border was cordoned off by the military for security reasons.
出于安全原因，军队将边境封锁了。