Lub qhov rooj hluav taws yog hais txog lub qhov rooj nrog hluav taws kub, uas feem ntau yog siv ua ke nrog cov qhov rooj hluav taws. Thaum muaj hluav taws kub, hluav taws kub qhov rooj thiab qhov rooj hluav taws tuaj yeem tau txais lub sijhawm rau tib neeg kom dim ntawm qhov hluav taws kub, tiv thaiv hluav taws, thiab ncua kev sib kis ntawm hluav taws. Yog li ntawd, hluav taws qhov rooj thiab qhov rooj hluav taws ua lub luag haujlwm tseem ceeb hauv qhov tshwm sim ntawm hluav taws.