Cov ntawv caw dawb lias yog ib qho ntawm ntau cov khoom ntim ntim hauv ntim cawv. Muaj tiag tiag ntau qhov laj thawj uas yog vim li cas cov xim caw cawv txiv hmab txiv ntoo yog li nrov hauv khw.
Hais txog cov tsos, cov cawv txiv ntoo fwj muaj ntau yam xim, iav Li Cawv Lub raj mis zoo nkauj ua qauv, Cov iav cawv thiab lub ntsej muag tshiab, uas tau zoo heev txhim kho cov khoom lag luam cawv thiab tseem ua lub luag haujlwm tseem ceeb hauv kev ntim ntim caw. Tsis tas li, cov xim tsis muaj xim nyob rau sab nrauv ntawm cov kua txiv hmab uas muaj cawv tuaj yeem tiv thaiv qhov kev ua kom tsis muaj dej los ntawm cov khoom ua cawv sab nraud los ntawm cov duab tshav ntuj sab nrauv rau qee yam, Khob Dej cawv uas tuaj yeem khaws tau cov cawv zoo thiab txuas ntxiv lub sijhawm khaws.
Tsis tas li ntawd, txawm hais tias cov txheej txheem ntau lawm ntawm cov cawv txiv hmab dawb cawv yog qhov nyuaj, Cov Dej Cawv Li Cawv Dej Cawv lub ntsej muag tag nrho nws txawv. Cov xim pauv tau thiab cov duab ntawm cov kua txiv muaj cawv zoo nkauj tsis tau yog piv rau cov cawv txiv hmab zoo nkauj, Cov Dej cawv Cawv Dej cawv uas yog vim li cas feem ntau ntawm cov khoom cawv txiv hmab hauv khw.
Qhov laj thawj yog vim li cas lawv txhua tus pib siv cov cawv txiv ntoo fwj, iav Dej cawv Lub Raj Dej nws muaj peev xwm hais tau tias cov cawv txiv ntoo dawb lub raj mis tau txais txhua qhov zoo ntawm cov cawv txiv ntoo iav fwj, xws li cov khoom zoo ntawm cov khoom muag, Cov Dej cawv Cawv tsis kam corrosion thiab cov khoom muaj tshuaj lom neeg. Qhov no kuj tseem yog vim li cas vim li cas cov yeeb yuj cawv muaj cawv txhua qhov npau taws.
