Vuam txhais tau tias rau vuam cov ntaub ntawv raws li cov kev cai rau kev tsim kho ntawm ib tug tswv cuab raws li cov kev cai tsim, thiab muaj peev xwm ua tau raws li qhov yuav tsum tau ntawm cov kev pab cuam predetermined.Los ntawm cov khoom siv vuam, vuam, cov khoom siv thiab kev siv cov kev xav tau cuam tshuam rau plaub yam.Tsawg...
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