Ua los ntawm cov khoom siv ntoo-yas sib xyaw, lub lawj board no muaj zog ntau dua li cov kev xaiv hollow thiab nyob twj ywm txawm tias nyob rau hauv kev hloov pauv sab nraum zoov. Nws yuav tsis tau pwm yooj yim nyob rau hauv cov huab cua ntub, zoo meej rau cov chaw ntiav pw hauv ntug dej hiav txwv thiab cov chaw ntub dej sab nraum zoov. Koj tau txais cov ntoo zoo li yam tsis muaj kev pleev xim lossis kev saib xyuas hnyav. Yooj yim rau nruab, nws ua haujlwm zoo rau tsev so patios, txoj kev taug kev thiab chaw so sab nraum zoov, txuag koj txoj haujlwm tu mus ntev.
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