Dab tsi yog qhov sib txawv ntawm cov ntawv pov tseg qhuav thiab cov ntawv nplaum dawb?
Qhuav erase markers thiab whiteboard markers yog qhov tseem ceeb tib yam. Ob hom cim yog tsim los siv rau ntawm cov ntawv dawb.
Sau koj cov lus ntawm no thiab xa tuaj rau peb
