Tam sim no ntau qhov chaw hauv tsev kawm ntawv, xws li chav kawm, gymnasiums, auditoriums, chav sib tham loj, thiab lwm yam, xav tau cov khoom siv kho kom zoo nkauj kom dhau qhov kev tshuaj xyuas hluav taws thiab muaj cov ntaub ntawv tshuaj ntsuam xyuas hluav taws, uas cuam tshuam cov nplaim hluav taws ua haujlwm ntawm cov suab nrov nrov. .Hluav taws kub-resista...
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