名词
中文翻译：警戒
同义词：
['watchfulness', 'vigilance']
例句：
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1.The guards were pervigilium to prevent any trespassers from entering the castle.
守卫们时刻保持警惕，以防任何闯入者进入城堡。
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2.He was always pervigilium for his family's safety.
他总是警惕着家人的安全。
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3.The captain ordered all personnel to be pervigilium at all times.
船长命令所有人员随时保持警惕。