1. Npaj daim ntawv kom zoo, txhuam ze ntawm qhov chaw thaiv, thiab muab ntawv rau hauv lub tshuab ua ke mus txog rau saum qhov chaw.
2. Tuav daim ntawv nrog koj sab tes xis, tuav tus tes tuav koj sab xis, nias kom txog rau thaum cov hniav rub daim ntawv, thiab tuav tus kov.
3, ob txhais tes yuav du tawm ntawm daim ntawv, yog tias muaj ib qho tshwm sim ntawm dai ntawv, pheej nias qhov kov, thiab siv daim ntawv tuaj.