1. Cov txheej txheem no qhia meej txog kev faib khoom, cov txheej txheem kev ua haujlwm, cov txheej txheem kuaj, cov cai tshuaj xyuas, ntim khoom, tsheb thauj mus los thiab khaws cov fwj cawv.
2. Cov txheej txheem no siv rau iav fwj uas muaj cawv zoo tib yam. Tsis suav nrog tshwj xeeb, tiv taus cov iav fwj iav.