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Ntsug qhov muag ceev
Nruam tas mus li tsis tu ncua retilization kab tau kov yeej ntau cov thev naus laus zis roj ntsha hauv kev kawm tsis muaj menyuam, thiab txhawb nqa cov txheej txheem ua kom tsis muaj menyuam ntawm kev ua lag luam. Lub kaw lus muaj cov txuj ci siab pib, thev naus laus zis siab, qauv kom tsis muaj menyuam yaus ntawm cov kev taw qhia tuaj yeem tom qab ua kom tsis muaj menyuam. Nws tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm kev ua haujlwm txuas ntxiv thiab pawg ntau lawm.