形容词
中文翻译：Unknown
同义词：
['vigilant', 'watchful', 'wary', 'alert']
例句：
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1. The new security system is designed to be alert-headed.
新的安全系统设计得具有高度警觉性。
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2. She was alert-headed enough to notice the suspicious behavior of the stranger.
她足够警觉，注意到了陌生人可疑的行为。
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3. The team leader was alert-headed and quickly took action to address the situation.
团队领导警觉并迅速采取行动处理了情况。