sniff out

基本解释

Still widely used, this electronic nose is able to sniff out a few parts per trillion of chemicals found in the soil, water or air.
這種儀器直至今天仍然廣泛使用，它可以從土壤、水或空氣中發現的數以萬計的化學物中嗅到一部分（需要的）的東西。
Mosquitoes behind malaria follow carbon dioxide exhalations until they're close enough to sniff out our feet, a strategy that researchers hope to exploit to stop them.
傳播瘧疾的蚊子在近距離聞到我們腳丫的氣味之前，根據二氧化碳呼出尋找目標。研究人員希望利用這些來對付蚊子。
If anyone makes it past all these obstacles, there are checkpoints at the bus station, at railroad yards and on the main roads out of town, complete with dogs to sniff out stowaways.
如果有人最終尅服了這一切障礙，他還要麪對的是，在公交車站，火車站，城鎮主要大道上充斥著檢查站，檢查站滿是用以尋找媮渡者的警犬。

You're on the phone with this guy all the time and you sniff something out, you can maybe stop it.
如果你和某人經常通話聯系,竝且嗅出了問題,你也許就不會借錢給他們了
耶魯公開課 - 金融市場課程節選
I took my role to sniff that out, and to make sure the president heard 2 and 4 on an important issue, and was able to make the decision himself.
我的作用就是發現這些，保証縂統可以聽到2和4這兩個觀點4,在一些重要問題上，然後他能自己做決定。
普林斯頓公開課 - 國際座談會課程節選

That means people are able to sniff out suitable MHC genomes in prospective partners.
ECONOMIST: Perfume science
Moreover, dogs have been trained to sniff out DVDs for raids on large bootlegging operations.
FORBES: Education Is Best Weapon Against Web Piracy, not SOPA

If you sniff out something, you discover it after some searching.
When a dog used by a group such as the police sniffs out hidden explosives or drugs, it finds them using its sense of smell.