Tso tseg txoj kev qhia “chalk + blackboard + phau ntawv” txoj kev qhia, rau kev qhia online, sib tham sib pawg thawj coj saib lub vijtsam loj hauv chav kawm tau dhau los ua tus choj rau kev sib tham ntawm tus kws qhia-cov tub ntxhais kawm, rau kev qhia online sib tham sib pawg thawj coj saib thiab daim ntawv thov ntawm tus qauv tshiab ntawm kev qhia thiab kev kawm muaj rau kev qhia online muab qhov tseem ceeb tshiab rau chav kawm tho txawv kev sib tham sib pawg thawj coj saib.