Ntoo qhov rooj hluav taws yog ib hom hluav taws kub qhov rooj, kuj yog cov khoom siv hluav taws xob, yog ua los ntawm cov ntoo, yog li los ntawm cov khoom siv hluav taws xob hu ua qhov rooj hluav taws, txawm tias nws yog ntoo, tab sis kev siv ntoo yog tom qab kev kho tshwj xeeb, thiab yog hluav taws kub. kev tiv thaiv, yog li nws yog ib yam ntawm cov khoom siv hluav taws xob, tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm cov rwb thaiv tsev kub thiab hluav taws kub.

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