Dav Dav

Tag nrho cov qauv vaj huam sib luag yog khoom kim heev thiab zoo nkauj, cov xim npog ntsej muag yog xim ntsuab tsaus thiab xim av (muab raws li qhov xav tau xim ntawm cov qauv tsim sab hauv tsev sib txawv tshwj tsis yog cov xim txheem). Kev tsim qauv ntawm lub npog ntsej muag muab qhov kev xav zoo nkauj thiab zoo nkauj. Dawb huv lvory. lub zog siab, tsis hloov xim, cov khoom pob tshab yog PC. Lub thav duab ruaj khov, cov qauv yooj yim thiab kev teeb tsa yooj yim.