Peb cov neeg tuaj tshiab los ntawm Nyij Pooj tso nws thawj daim ntawv hais txog cov khoom uas tau tsav, thiab seb cov duab yeeb yam yog qhov tseem ceeb ntawm cov khoom siv tsav yog raug ua los ntawm lub 6 m m phom tooj dej. Xav tau ntau txoj kev koom tes yav tom ntej.
