The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human sense of smell is feeble and undeveloped.

人们通常不重视嗅觉的原因是，虽然嗅觉对于动物很重要，但人类的嗅觉是薄弱而不发达的。

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The reason that many nice people get taken advantage of is because they have a low level of self confidence and people smell that right away.

之所以那么多心地温和的人被别人利用，是因为他们缺乏自信，而恰恰被别人抓住了这个弱点。

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The seaside’s “bracing” smell is caused by a chemical produced by coastal bacteria, present in very low concentrations.

答：并不完全如此。 海风的气味让人振奋是缘于一种沿海细菌的化学产物，尽管它在空气中比例甚微。

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"Temperatures as low as -3C have affected the sniffer dogs' sense of smell, " it added.

BBC: Tibet mine landslide: Hopes fade for survivors

They found some evidence that low concentrations of dopamine, a brain chemical, may respond to the sight and smell of food in an addictive manner for some obese people.

NPR: Rabid Reader: 'Fat Land' and U.S. Supersizing