Cov qauv ntim ntawm cov thawv ntawv yuav tsum tau siv tag nrho cov yam ntxwv ntawm ntau yam ntawm cov duab, txawj siv daim ntawv los qhia cov khoom nta thiab kev zoo nkauj ntawm lub ntim. Qhov tseeb, daim ntawv lub thawv tsim muaj ntau dua li tsuas yog tsim peb lub - qhov ua kom pom ntawm lub thawv; nws kuj tseem suav nrog cov txheej txheem thev naus laus zis ntawm cov txheej txheem tsim khoom, suav nrog lub thawv cov qauv qauv, tuag- txiav, thiab gluing. Tag nrho cov no yuav tsum tau ua tib zoo xav txog thaum lub sij hawm tsim. Qhov no xav kom cov neeg tsim qauv muaj kev nkag siab zoo txog cov txheej txheem txheej txheem koom nrog hauv cov thawv ntawv kom lawv cov qauv tsim tuaj yeem ua tiav hauv kev tsim khoom.
