Peb muaj ib pab neeg tshaj lij los pab peb cov neeg siv khoom nrog cov ntaub ntawv siab tshaj plaws nrog cov ntaub ntawv ntawm txhua tus neeg siv khoom.
Cov khoom siv tsis tu ncua yog ua rau txheeb xyuas cov khoom lag luam muaj nuj nqi tau zoo thiab ua kom tau raws li koj cov kev xav tau.