Tom qab lub qhov rooj hluav taws qhib, lub qhov rooj kaw yuav cia li qhib thiab kaw lub qhov rooj hluav taws kom kaw, yog li thaum muaj hluav taws kub ceev, lub qhov rooj hluav taws tuaj yeem cais tawm thiab txwv tsis pub kis hluav taws.