Nrog rau qhov tshwm sim ntawm ntau thiab ntau lub tsev siab, cov txheej txheem ntawm kev tiv thaiv xob laim tau dhau los ua neeg paub tab. Txawm li cas los xij, tib neeg tseem muaj kev nkag siab tsis zoo txog kev tiv thaiv xob laim. Ntau tus neeg ntseeg tias kev txhim kho cov cuab yeej tiv thaiv hluav taws xob txhais tau tias txhua yam zoo thiab yuav tsis muaj kev phom sij ntxiv ntawm kev raug xob laim. Qhov tseeb, kev tiv thaiv xob laim yog kev tiv thaiv ntau dua. Cov vaj tsev uas muaj qhov siab thiab cov khoom siv tib yam yuav ua rau muaj kev cuam tshuam tsis zoo rau cov hluav taws xob ntau dua li cov uas tsis muaj kev tiv thaiv hluav taws xob. Ntxiv mus, tom qab txhim kho cov cuab yeej tiv thaiv xob laim, lawv yuav tsis kuaj xyuas lawv dua, uas yog qhov tsis ncaj ncees lawm. Txhua qhov system tsis tuaj yeem ua yam tsis muaj kev kho thiab kho tom qab.
Pib los ntawm kev paub zoo ntawm kev tiv thaiv hluav taws xob tiv thaiv hluav taws xob hluav taws xob (tseem hu ua hluav taws xob hluav taws xob), qee cov neeg ntseeg tias ntev npaum li cov hlua hluav taws xob raug teeb tsa, txhua yam yuav zoo. Qhov tseeb, qhov lawv tsis paub yog tias tus pas nrig, zoo li txhua yam khoom, yuav maj mam hnav. Raws li nws feem ntau ntsia sab nraum cov tsev thiab raug cua, nag, thiab corrosion los ntawm qee yam khoom hauv huab cua, ua ke nrog oxidation, cov pas nrig xob laim maj rusts thiab ntog, ua rau nws tsis kam thiab tsis tuaj yeem tso hluav taws xob tam sim no raws sijhawm. Yog tias nws tsis raug kuaj pom raws sijhawm, tus pas nrig hluav taws xob kuj tseem tuaj yeem tso tsis tau hluav taws xob tawm hauv lub sijhawm, ua rau muaj teeb meem ntawm xob laim.
Kev soj ntsuam tiv thaiv xob laim tsis tu ncua yog qhov tseem ceeb heev. Txawm hais tias lawv paub qhov tseem ceeb ntawm kev ntsuas kev tiv thaiv xob laim, qee cov neeg siv yuav xav tias ib qho kev sim txaus thiab tsuas tsis to taub tias cov chaw tiv thaiv no yuav tsum tau sim tsis tu ncua. Txawm hais tias nws yog kev tiv thaiv sab hauv lossis sab nraud, nws muaj qee yam lifespan, uas yog ze ze rau qhov zaus thiab kev siv ntawm xob laim. Kev soj ntsuam kev tiv thaiv xob laim tuaj yeem tshawb xyuas tam sim ntawd tsis tsim nyog cov cuab yeej tiv thaiv xob laim kom hloov raws sijhawm.