Kev xa khoom
-Peb ntim tag nrho cov khoom nrog ceev faj heev, siv cov txheej txheem ntim khoom kom ntseeg tau tias koj cov khoom tuaj txog hauv qhov zoo.
-Cov khoom yuav raug xa tawm tsis pub dhau 24 teev ib txwm (tshwj tsis yog hnub so thiab hnub so) yog tias cov khoom lag luam tawm, nws xav tau sijhawm ntxiv los npaj.