Cov khoom lag luam uas yuav tsum tau khaws cia sab hauv tsev thiab muab tso rau hauv qhov qhib cua yuav tsum zam cov dej nag nkag mus rau hauv lub raj mis kom tiv thaiv cov dej tsis tshwm sim.
Tus txheej txheem no qhia meej txog kev faib khoom, kev xav tau txuj ci, txheej txheem kev tshuaj xyuas, cov cai tshuaj xyuas, ntim khoom, thauj mus los, thiab khaws cov fwj fwj.
Tus txheej txheem no siv rau iav fwj uas muaj cawv zoo tib yam. Tsis suav nrog tshwj xeeb, tiv taus cov iav fwj iav.