Cov khoom iav, feem ntau, tsis muaj teeb meem rau tib neeg lub cev. Cov iav yog cov khoom tsis muaj tshuaj lom thiab tsis muaj zog, uas txhais tau hais tias nws tsis tso cov tshuaj phem lossis cov tshuaj uas tuaj yeem ua rau muaj kev phom sij rau kev noj qab haus huv thaum sib cuag nrog lub cev.
Thaum cov iav raug tsim thiab siv raws li nws lub hom phiaj, nws pom tau tias muaj kev nyab xeeb rau tib neeg siv. Cov iav feem ntau yog siv rau hauv ntau daim ntawv thov, xws li cov iav haus, cov thawv ntim khoom noj, qhov rais, thiab cov khoom siv kho kom zoo nkauj, tsis muaj kev phom sij rau kev noj qab haus huv.
Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias iav tuaj yeem tawg lossis tawg, thiab ua rau cov npoo ntse lossis cov shards tuaj yeem ua rau raug mob yog tias tsis siv. Nws yog ib qho tseem ceeb los tswj cov khoom iav nrog kev saib xyuas thiab zam cov xwm txheej uas iav tuaj yeem tawg thiab muaj feem cuam tshuam rau tib neeg.
Tsis tas li ntawd, qee yam khoom siv iav tuaj yeem muaj cov coatings, kho kom zoo nkauj, lossis cov khoom siv ntxiv uas tuaj yeem ua rau muaj kev phom sij yog tias noj lossis nkag mus rau lub cev ntev. Nws raug nquahu kom ua raws li cov chaw tsim khoom cov lus qhia thiab cov lus qhia thaum siv cov khoom iav thiab kom ntseeg tau tias lawv tau npaj rau lub hom phiaj tshwj xeeb uas koj xav tau.
Hauv cov ntsiab lus, thaum iav nws tus kheej tsis muaj teeb meem rau tib neeg lub cev, yuav tsum tau ceev faj kom tsis txhob raug mob los ntawm cov iav tawg, thiab nws yog ib qho tseem ceeb uas yuav tsum tau siv cov khoom siv iav raws li lawv qhov kev npaj siv thiab txhua yam kev nyab xeeb uas muab los ntawm cov chaw tsim khoom.
