sniffer dog
noun [ C ] uk/ˈsnɪf.ə ˌdɒɡ/ us/ˈsnɪf.ɚ ˌdɑːɡ/
嗅探犬（经过训练专门用于嗅探毒品和炸弹的狗）
a dog that is trained and used by the police or army to find hidden drugs or bombs, or to find someone the police are looking for, using its sense of smell
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