Ua ntej, qhov pov tseg ntawm cov khoom phem
Hauv qhov txheej txheem ntawm cov khoom tsim, cov khoom tsis zoo tsim, yuav ua rau tib neeg, khoom siv thiab muaj khib nyiab ntawm lub sijhawm, yog qhov khoom ntawm cov nyiaj laus ua haujlwm, poob ntawm cov ntaub ntawv thiab kev ua haujlwm, kev txiav txim thiab kev poob siab ntawm kev ua lag luam, yog qhov yuav tsum tau them ntxiv cov nqi. Aluminium alloy ntau lawm yuav tsum ntxov mus tshawb qee yam khoom phem, nrhiav thiab paub cov chaw phem, uas yog txo cov tiam ntawm cov khoom uas tsis tsim nyog, thiab sim ua kom tiav "thawj zaug ua qhov yog." Raws li qhov zoo tshaj plaws nyob rau hauv qhov tsim tawm ntawm qhov yuav tshem tawm cov khoom ntawm cov khoom phem, peb yuav tsum tau tiv thaiv kev tiv thaiv kom tsis txhob muaj cov khoom nyhav thiab cov khoom ua tiav cov khoom tiav rau tom qab tus txheej txheem, nrhiav kev xoom seem.
Thib ob, qhov pov tseg ntawm ntau dhau lawm
Lean ntau lawm txhais tau hais tias yog "sijhawm," uas yog, thaum tus qhua tuaj yeem ua tus qhua tuaj yeem tus naj npawb ntawm txhuas tus qauv, ntau dhau lawm los yog dhau lawm kuj yog pov tseg.