1. n.踪迹，线索，嗅觉，敏锐的感觉2.v.察觉，发觉，看破(阴谋等)，闻着气味追赶
O. to be off the～(= get the wrong～)失去猎物的踪迹，错误的线索，迷失方向，作出错误的判断，抓住错误的线索

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to follow up the～闻着臭迹追赶

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to get the～of(= take the～of)闻出，发觉

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to have a keen～for an error有发现错误的敏锐感觉

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have no～for对于……没有感觉

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to hunt by～凭嗅觉追赶，循臭迹追猎

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on the right(wrong)～线索正确(错误)，得法(不得法)

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on the～of获得……的线索，如to be hot on the～of the important discovery及时抓住重大发现的线索追查

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put off the～= put(throw)sb. on a wrong～(用替身)使人追错方向而逃走，使人迷失方向(线索)

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put sb. on the～让人跟着追赶，让人跟踪追赶