What the plants pumpthrough the air is a mixture of chemicals known as volatile organic compounds, VOCs for short.
植物通过空气输送的是一种名为挥发性有机化合物（简称VOCs）的化学混合物。
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"Salmon," notes writer Susan Ewing in The Great Alaska Nature Factbook, "pumpthrough Alaska like blood through a heart, bringing rhythmic, circulating nourishment to land, animals and people".
The potentially damaging byproducts of the stress response, such as cortisol, nevertheless continue to pumpthrough the body, and exercise helps offset that effect.