动词短语中文翻译
中文翻译：保持警戒
同义词：
['guard', 'keep watch']
例句：
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1.The soldiers kept sentries at the border to prevent any intruders.
士兵们在边境处守卫，以防止任何入侵者。
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2.The policeman kept sentries around the clock to ensure public safety.
警察全天候巡逻，以确保公共安全。
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3. The guards kept sentries outside the castle gate to protect the royal family.
守卫们站在城堡大门外，保护皇室成员。