Others are chosen for their smell. Generally, herbs come from the green leaves of plants or vegetables.

VOA: special.2009.05.19

You begin to hear, or perhaps smell, the slight whiff of jargon that pervades theoretical writing. It often does so for a reason.

你开始听出，或者嗅出遍布理论文章中的术语的味道,这往往是有道理的。

耶鲁公开课 - 文学理论导论课程节选

But the smell is very distinctive and for me--was new to me.

烈酒的气味十分特殊,对我来说，这是种全新的气味。

耶鲁公开课 - 心理学导论课程节选

For example, the insects can smell carbon dioxide in the breath of a person or animal from as far away as sixty meters.

VOA: special.2009.05.26

Others are chosen for their smell. Still others were used traditionally for health reasons.

VOA: special.2010.06.01