smell out

动词 smell out:

1. recognize or detect by or as if by smelling
   同义词：sniff out, scent out, nose out

1. The Secret Service smelled out a plot to kill the President.
   情报部门抽丝剥茧发现了要行刺总统的阴谋。
2. Specially-trained dogs can smell out drugs.
   受过特殊训练的狗能嗅出毒品。