Muaj ntau hom kev sib khi ntawm lub qhov rooj hluav taws, nrog rau kev hnav tsis kam, kub tsis kam, khawb tsis kam, nkag mus rau hauv qhov rooj, thiab qhov rooj hluav taws yog noo-pov thawj, tsis-fading, thiab muag heev rau kov. Peb lub qhov rooj hluav taws yog pheej yig, txais tos los tham nrog peb.

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