嗅探器

例句：

1. 1. The police used a scent odor to track down the thief.
   警方使用一种气味来追踪小偷。
2. 2. The scientist used an odor detector to identify the source of the smell.
   科学家使用气味探测器来识别气味的来源。
3. 3. The dog was trained to detect the scent of drugs in the air.
   狗被训练来探测空气中的毒品气味。