Cov tsos mob siv "panda xim" kom paub qhov txawv ntawm lub tsho los ntawm lub cev tseem ceeb, cov qauv yog ntau compact thiab lub teeb yuag, cov khoom siv ib txwm ua tau zoo, cov yam ntxwv ntawm cov khoom tseem ceeb, thiab cov khoom lag luam tau paub ntau dua.