XIYE optimize hluav taws xob arc rauv tshuab, thiab tau txais qhov zoo tshaj plaws tshuav nyiaj li cas los ntawm raw cov ntaub ntawv, seem preheating, kev txuag hluav taws xob, kev tiv thaiv ib puag ncig, txheej txheem tswj, tsis siv neeg tswj, smelting voj voog, muaj peev xwm, thiab lwm yam.
Cov khoom siv no yog ib puag ncig, muaj txiaj ntsig zoo, ua haujlwm siab, siv tau yooj yim ntawm ntau yam nqi los tsim cov hlau tshwj xeeb.