动词短语
中文翻译：警戒
同义词：
['be on the lookout', 'be vigilant', 'be wary']
例句：
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1. He was on guard for any danger that might come his way.
他时刻警惕着可能到来的危险。
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2. The police were on guard to prevent any break-ins.
警察时刻警惕着防止任何入室盗窃。
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3. She was on guard for her safety and security.
她时刻警惕着保护自己的安全和安全。