This refers to the use of a miniature BTE hearing aid that is coupled to an ear insert or earmold (vented or unvented) via a tubing of approximately 0.8 mm inner diameter.
就是微型耳背式助听器用一根内径大约0.8
合到耳塞或者耳模（耳模可以开或者不开通气孔）验配方式。
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Fossil fuel combustion, biomass burning, wildfires and unvented gas heaters are common sources of air pollutants. A large cohort study in never smokers showed a strong association between ambient fine particulate matter concentration and lung cancer mortality.
化石
料
、生物质、
火和不通风的气加热器是空气污染物的常见
源。一项针对从不吸烟者的大型队列研究表明，环
粒物浓度与肺癌死亡率之间存在密切关联。
