Ib qho kev daws teeb meem rau qhov hnyav daim hlau cia, ib qho hneev me me tso cai rau kev hloov pauv hloov pauv hloov thaum tswj kev sib raug zoo nrog ntau hom kev hnyav. Ua tsaug rau DHZ cov khoom siv muaj zog thiab kev tsim khoom, cov qauv ntawm cov cuab yeej siv tau ruaj khov thiab muaj tsib xyoos lav.
