Lub hnab tshuaj yej peb sab sawv ntsug muaj qhov zoo ntawm kev ua tau zoo heev thiab cov khoom siv sib xyaw ua ke muaj zog, Kev sib khi zoo thiab tsis muaj qhov xau, lub teeb yuag, siv khoom tsawg dua, thiab yooj yim thauj mus los.
Lub hnab ntim peb sab zoo heev, thiab nws tuaj yeem tiv thaiv cov khoom noj kom tsis txhob muaj kuab paug lossis puas tsuaj thaum lub sijhawm khaws cia thiab thauj mus los. Hom ntim khoom no feem ntau siv cov thev naus laus zis kub, uas tuaj yeem kaw peb sab ntawm lub hnab, ua rau nws yog qhov chaw kaw tag nrho kom ntseeg tau tias cov khoom noj tshiab thiab muaj kev nyab xeeb, cov qauv yooj yim thiab yooj yim qhib, Nws muaj cov yam ntxwv rov ua dua thiab kev tiv thaiv ib puag ncig.
Cov khoom ntim khoom muaj kev ua tau zoo xws li tiv thaiv hluav taws xob, tiv thaiv ultraviolet, thaiv cov pa oxygen thiab dej noo, thiab yooj yim rau kaw. Cov hnab sawv ntsug yog cov tshuaj tiv thaiv, ci ntsa iab. Feem ntau yog cov khoom rwb thaiv tsev zoo. Nws yog lub teeb thiab ruaj ntseg. Yuav tsim tau ntau thiab pheej yig.
Cov hnab no siv tau ntau yam, siv tau yooj yim, yooj yim rau xim, thiab qee qhov kuj tiv taus qhov kub thiab txias siab. Cov hnab sawv ntsug niaj hnub no muaj kev nyab xeeb thiab zoo nkauj. Kev nyab xeeb tau lees paub, Nws tuaj yeem ua kom peb cov khoom muaj kev nyab xeeb thaum thauj mus los thiab txo cov kev pheej hmoo thauj mus los. Tib lub sijhawm, Lub hnab no muaj kev sib khi ceev ceev thaum tshav kub, tiv taus siab thiab tiv taus poob. Txawm tias nws poob ntawm qhov siab, nws yuav tsis ua rau lub cev hnab tawg lossis xau, uas ua rau cov khoom muaj kev nyab xeeb zoo dua.