sniff

n. 以鼻吸气,吸入的东西,气味
v. 嗅,发觉

The dog was sniffing at the lamppost.

那条狗在灯柱旁嗅来嗅去。

His generous offer is not to be sniffed at.

对他的慷慨厚意不可嗤之以鼻。