Nyob rau hauv lub chaw ua haujlwm tam sim no thiab kev kawm arenas, whiteboard markers tau tshwm sim raws li indispensable siv. Lawv tsis tsuas yog muab rau peb nrog kev yooj yim ntawm kev sau ntawv thiab kos duab tab sis kuj ua lub luag haujlwm tseem ceeb hauv kev xa khoom thiab kev sib pauv ntaub ntawv.
