Cov qhov rooj hluav taws tau muab faib ua ib txwm qhib thiab ib txwm kaw. Feem ntau qhib qhov rooj hluav taws feem ntau yog qhib thiab siv rau kev hla. Lub qhov rooj hluav taws uas ib txwm kaw tuaj yeem thaiv kev cuam tshuam ntawm cov pa taws thiab hluav taws tom qab hluav taws kub, yog li nws yog ib qho tseem ceeb rau kev tiv thaiv hluav taws.