Kev tsim, ua, kev yuav khoom, tshuaj xyuas, khaws cia, sib dhos txheej txheem yog tag nrho hauv cov txheej txheem kev tshawb fawb thiab cov ntaub ntawv siv tau zoo, nce qib kev siv thiab kev ntseeg siab ntawm peb cov khoom lag luam sib sib zog nqus, uas ua rau peb dhau los ua tus xa khoom zoo tshaj plaws ntawm plaub yam khoom loj hauv lub plhaub castings hauv tsev thiab tau txais lub cov neeg siv khoom ntseeg zoo.