Kev luam ntawv tau muab faib ua peb theem: Kev luam ntawv ua ntej → yog hais txog kev ua haujlwm nyob rau theem pib ntawm kev luam ntawv, feem ntau xa mus rau kev yees duab, tsim, ntau lawm, kev sau ntawv, cov ntawv pov thawj zaj duab xis, thiab lwm yam; Thaum lub sij hawm luam ntawv → hais txog cov txheej txheem ntawm luam ntawv tiav cov khoom ...
Nyeem ntxiv