Tes nwg rov has rua kuv tas, “Thooj ntawv dlov ntawd yog sau tej lug foom phem kws yuav tawm moog thoobplawg lub tebchaws. Nyob rua ntawm thooj ntawv dlov ntawd, muaj ib saab sau has tas txhua tug tubsaab yuav raug muab tshem tawm huv lub tebchaws moog; hab nyob rua ib saab sau has tas txhua tug kws coglug dlaag yuav raug tshem tawm moog ib yaam nkaus.