sniff at

• vt. 嗅(轻视)

例句

用作及物动词 (vt.)

1. The dog was sniffing at the lamppost.
   那条狗在街灯柱旁嗅来嗅去。
2. They are training these dogs to sniff out drugs.
   他们训练狗嗅出毒品来。