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
背式助听器
内径大约0.8毫米的
导管耦合到塞
模（模可以开不开通气孔）的验配方式。
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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.
化石燃料燃烧、生物质燃烧、野火和不通风的燃气加热
气污染物的常见
源。一项针对从不
的大型队列研究表明，环境细颗粒物浓度与肺癌死亡率之间存在密切关联。
