动词短语
中文翻译：保持警惕
同义词：
["keep one's eyes peeled", 'be vigilant', 'be on the lookout']
例句：
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1. We need to be on the alert for any suspicious activity in the area.
我们需要保持警惕，以防该区域出现任何可疑活动。
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2. The police are on the alert for any potential threats.
警方随时准备应对任何潜在的威胁。
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3. It's important to be on the alert when driving in heavy traffic.
在交通拥堵时开车时保持警惕很重要。