Lub qhov rooj thawb pas nrig muaj cov qauv muaj zog, uas tiv thaiv cov neeg sab nrauv nkag mus rau sab hauv yam tsis tau tso cai, tab sis tso cai rau cov neeg sab hauv tawm mus thaum muaj xwm txheej ceev. Thaum siv yam tsis tau kev tso cai, nws yuav suab lub tswb nrov-decibel.Lub ntsuas phoo tuaj yeem qhib los ntawm nias lub zog ntawm qee qhov ntawm lub cev. Nws feem ntau yog siv rau ntawm qhov rooj hluav taws ntawm qhov hluav taws kub tawm kom paub txog kev khiav tawm thaum muaj xwm txheej kub ntxhov. Tam sim no nws yog siv nyob rau hauv qhov chaw uas muaj neeg coob.

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