sniff

The police dog sniffed the luggage at the airport to detect any illegal substances.

(Chinese) 警犬在机场嗅闻行李，以检测是否存在违禁物品。

She sniffed the milk to make sure it hadn't gone sour before drinking it.

(Chinese) 她在喝牛奶前先闻了闻，确保它没有变质。