Kev ua dej kom qhuav yog qhov dej ntawm cov dej tseem los tswj cov ntoo tais. Tsuas yog cov dej ua kom qhuav zaum kawg yuav tsum tau muab dej rau hauv cov ntoo uas tau muab tso rau hauv qab ntawm 30%, kom ntxuav cov dej) Kom qhuav, cov txheej txheem ziab ntawm cov ntoo noo noo yog qhov ua kom qhuav ntoo, yog tias cov ntoo ua kom qhuav dua, vim tias cov ntoo kuj muaj kev thauj mus los thiab lwm qhov txuas.
Lub tiav lawm ua ke theem ntawm cov ntoo tais yog tsuas yog ua kom sib sau ua ke cov phaj ua tiav. Thaum txhua qhov chaw tiav lawm, cov ntoo ua ke sib dhos yog qhov tseem ceeb tshaj plaws hauv cov khoom lag luam ntoo, tab sis kuj tseem muaj kev tsim kho nyob rau hauv kev tsim khoom, thiab ntev kev ntsuas, lossis tuaj yeem ua tiav.
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