Thaum caij tsheb, tshwj xeeb yuav tsum tau them nyiaj rau cov khoom ntiag tug xws li cov roj, tsis yog vim tias nws kub ntxhov, tab sis kuj yog vim muaj cov khoom ua rau cov khoom kub nyhiab. Yog li ntawd, peb yuav tsum tsis txhob tsuas yog xav txog kev tiv thaiv ntawm nws cov cwj pwm phem, tab sis kuj tshem tawm nws qhov chaw tsis zoo.
Ua ntej tshaj plaws, kev tiv thaiv ntawm cov hluav taws kub yooj yim yog tawm tsam qhov qhib hluav taws, thiab tom qab ntawd ces peb yuav tsum paub vim li cas vim li cas cov roj yuav ua rau kev puas tsuaj. Lub ntsiab tseem ceeb ntawm cov roj rho tawm yog oxidation ntawm cov roj thiab cov rog. Vim yog raug cov pa oxygen, lub teeb, cov kab mob thiab cov khoom tso tawm thaum lub sij hawm cia, thiab nyob rau hauv lawv qhov kev txiav txim, roj yog yooj yim oxidized thiab ua cov tshuaj lom. Raws li nws cov oxidation puag, peb yuav tsum cais tawm cov pa oxygen, tsis txhob pom lub teeb, noo noo, thiab tsis txhob kov cov kab mob. Oxygen yog raug rho tawm, thiab qhov teeb meem ntawm oxidation vim kev sib cuag nrog cov pa tawm tsis muaj teebmeem. Tiv thaiv lub teeb thiab noo noo tiv thaiv kev nce qib ntawm oxidation cov tshuaj tiv thaiv thiab tshem tawm qhov kev xav tau ntawm kev sib cuag nrog microorganisms. Nws tsuas xav tau kev sib khi hauv ib lub nkev uas tsis muaj xim thiab tom qab ntawd mam li ntim. Nyob rau hauv no txoj kev, lub ntim ntawm cov khoom nyaum xws li roj thiab nqaijrog tsis yog ib qho teeb meem.
Cov khoom ntim khoom nyuab nyuab hais tsis yooj yim, nws yooj yim thiab yooj yim, nws xav tau ceev faj thiab xyuam xim, thiab txhua kauj ruam yuav tsum tau ua. Ntxiv nrog rau txoj kev xav thiab kev nkag siab txog nws cov yeeb yam, nws yog ib qhov tsim nyog yuav tau "muab cov tshuaj zoo" kom tshem tawm cov xwm txheej phem ntawm nws qhov kev mob. Nyob rau hauv txoj kev no, kev hem thawj ntawm kev tsim txom cov khoom raug txo ntau heev.
