Caveat: the researchers couldn't account for the presence of noise barriers or the floor level on which the subjects lived, factors that would influence traffic-noise exposure.
注意：研究人员并未考虑研究对象所居住环境中是否有隔音屏障以及居住楼层的差别，这些因素会影响暴露在交通噪音中的水平。
Air traffic in Argentina will remain suspended this Friday on account of the presence of volcanic ash after the eruption of Puyehue volcano in Chile.
智利普耶韦火山爆发产生的火山灰，造成阿根廷的空中交通本周五依然在中断中。
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