Muaj ntau hom hluav taws kub qhov rooj, nyob ntawm qhov xwm txheej ntawm qhov chaw. Cov khoom siv kho vajtse xws li cov tes tuav thiab cov xauv hluav taws ntawm lub qhov rooj hluav taws yuav tsum ua kom tiav.

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