Cov xwm txheej yooj yim heev rau cov khoom ntuag uas tsis muaj kev sib txig yog qhov sib txawv ntawm cov ntawv xov xwm los yog tsuas muaj tsawg ntawm cov hlab ntsha tawg hloov los ntawm lub me thiab lub teeb nyhav pub rau hloov loj thiab hnyav zog, muab cov kev mob siab rau kev kub nyhiab. . Hauv cov khoom siv phom nyhav, cov khoom siv pob khoom siv ncaj qha siv, thiab siv cov khoom siv nyhav los nkag rau hauv qhov chaw thaiv kev nyiag, ua kom tsis txhob muaj kev nyiag kev ua haujlwm.
Kev siv cov txuag uas tsis muaj kev txuag cov khoom siv yog qhov tseem ceeb rau kev ua kom muaj ntau tus qauv, kho cov qauv ntaub, txo cov ntaub npog, kho cov ntaub zoo, txo cov suab nrov, thiab kev txhim kho kev ua haujlwm. Lub khoob khawm tau muaj kev kub ceev thiab feem ntau yog 4-8 npaug ntau tshaj ib qho kev thauj mus los. Yog li ntawd, daim ntawv thov ntawm ib tug ntiv tes tsis muaj nyob hauv cheeb tsam loj tuaj yeem ua kom muaj zog tsim khoom.
