动词短语
中文翻译：对某事保持警惕同义词
同义词：
['be on the lookout for', 'be vigilant about', 'be wary of']
例句：
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1. We need to be alert to any potential threats in our environment.
我们需要对环境中的任何潜在威胁保持警惕。
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2. The police are being alert to any suspicious activity in the area.
警方正在警惕该地区的任何可疑活动。
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3. It's important to be alert to changes in weather conditions.
注意天气变化是很重要的。