名词
中文翻译：警戒圈
同义词：
['protective ring', 'defense ring', 'safetyring']
例句：
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1. The guard-ring around the castle was impenetrable.
城堡周围的警戒圈坚不可摧。
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2. The policeman placed a guard-ring around the crime scene to prevent furtherdamage.
警察在犯罪现场周围设置了警戒圈，以防止进一步破坏。
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3. Thesecurity guard placed a guard-ring around the entrance tokeep people out.
保安在入口周围设置了警戒圈，以防有人闯入。