Lub raj mis yas yog tsim los ntawm txheej txheem txhaj tshuaj. Txoj kev molding no siv lub hauv paus ntsiab lus ntawm koob txhaj tshuaj. Lub cev txhaj tshuaj yog lub tshuab txhaj tshuaj. Cov tshuaj txhaj ua kom yaj cov khoom yas, thiab cov ntiv tes siab ntawm lub raj mis yog cov roj siab ntawm no. Lub siab ua rau cov khoom nyoos hla dhau lub qhov me hu ua" qhov rooj" thiab tom qab ntawd ntws mus rau hauv pwm, tsim cov khoom siv raw. Nws cov yam ntxwv tseem ceeb yog: nws tuaj yeem tsim cov khoom lag luam pwm zoo ib yam hauv lub sijhawm luv; nws tuaj yeem ua haujlwm tau zoo los ntawm kev nkag mus rau cov khoom siv raw kom tshem tawm cov khoom lag luam pwm; nws tuaj yeem tsim cov khoom lag luam tuaj pwm nrog qhov siab qhov tseeb thiab cov txheej txheem nyuaj, thiab lwm yam. Ntawm qhov tod tes, cov peev txheej peev txheej loj, thiab cov nqi pwm yog kim. Xav txog qhov poob qis ntawm cov pwm, nws tuaj yeem hais tias txoj kev no tsis haum rau kev tsim khoom me me.
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