Studies have found a link between the disease and some chemical products.

VOA: special.2009.04.07

Energy means, you know, chemical reactions happen, and you end up with something that might be exothermic, that is, the products are more stable then the reactants.

能量表明，当反应发生之后，你最终会得到放热的产物，换句话说就是产物比反应物更稳定。

麻省理工公开课 - 热力学与动力学课程节选

Chemical sprays like air fresheners,hair spray, household cleaning products and even strong perfumes can also trigger an asthma attack.

VOA: special.2009.07.28

Chemical sprays like air fresheners, hair spray,cleaning products and even strong beauty aids can trigger an asthma attack.

VOA: special.2010.09.07

Nicotine replacement products provide the body with small amounts of the chemical through forms other than cigarettes.

VOA: special.2010.03.09

Glyphosate is a chemical used in Round-Up and other weed killing products.

VOA: special.2010.04.27