动词短语
中文翻译：Unknown
同义词：
['be on the lookout for', 'be on the alert for', 'be on the prowl for']
例句：
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1. The detectivewas on the scent of a murder suspect.
侦探开始追踪一个谋杀嫌疑人。
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2.She is on the scent of a new restaurant in town.
她正在寻找镇上新开的餐厅。
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3. The cat was on the scent of the mouse and started to chase it.
猫闻到了老鼠的气味，开始追逐它。