Cov ntaub so menyuam mos yog siv los ntxuav tus menyuam lub plab thiab daim tawv nqaij, tshem tawm cov khoom seem ntawm tus menyuam lub ntsej muag, lossis ntxuav cov khoom. Cov ntaub so me nyuam kuj tseem siv tau rau kev tshem tawm cov pleev thiab ua ib qho hloov rau daim ntawv tso quav.
