Lub qhov rooj xauv hluav taws kub yog qhov tseem ceeb ntawm lub qhov rooj hluav taws kub, thiab cov khoom siv tau zoo heev. Thaum muaj xwm txheej tshwm sim, nws tsis yooj yim rau kev puas tsuaj. Yog tias muaj hluav taws kub, qhov kub thiab txias tsis kam ntawm lub qhov rooj xauv hluav taws kuj tseem tuaj yeem pab ncua qhov hluav taws kub thiab ncua sij hawm khiav tawm.