Cov duab lus qhia, cov ntawv qhia txog cov ntawv qhia hauv av, cov ntaub ntawv qhia tau yog feem ntau siv hauv tsev loj. Cov khoom xws li cov kaus poom zaub mov, brevages nyob rau hauv cov hwj muaj tshwm nyob rau hauv pem teb sawv ntsug uas tuav tau hnyav hnyav. Rau cov khoom noj txom ncauj, muaj peev xwm tshwm rau ntawm cov lus nrog hooks.
Feem ntau cov yeeb nkab duab feem ntau yog muab tso nrog cov pos hniav thiab lwm yam khoom qab zib.
