1.Thaum xaiv cov khob ntawv pov tseg, tsis txhob saib cov xim ntawm lub khob ntawv xwb.Tsis txhob xav tias qhov xim ntawm cov xim dawb, qhov kev nyiam huv ntau dua.Txhawm rau ua kom lub khob zoo nkauj dua, qee lub khob ntawv cov tuam txhab ntxiv cov tshuaj fluorescent whitening ntau ntau.Thaum cov tshuaj phem no nkag mus rau tib neeg lub cev, lawv yuav dhau los ua cov carcinogens.Cov kws tshaj lij hais tias thaum xaiv lub khob ntawv, cov pej xeem yuav tsum tau thaij duab hauv qab lub teeb.Yog tias lub khob ntawv pom xiav nyob rau hauv lub teeb fluorescent, nws txhais tau hais tias tus neeg sawv cev fluorescent tshaj tus qauv, thiab cov neeg siv khoom yuav tsum siv ceev faj.

2.Lub khob lub cev yog mos thiab tsis muaj zog, yog li ceev faj txog cov dej ntws.Tsis tas li ntawd, xaiv cov ntawv khob nrog cov phab ntsa tuab thiab tawv.Cov khob ntawv nrog lub cev tsis zoo yog mos heev thaum pinched.Tom qab nchuav dej los yog dej haus, lawv yuav raug deformed heev thaum khaws, lossis txawm tias tsis tuaj yeem khaws, uas yuav cuam tshuam rau kev siv.Cov kws tshaj lij taw qhia tias feem ntau cov khob ntawv zoo tuaj yeem tuav dej rau 72 teev yam tsis muaj dej, thaum lub khob ntawv tsis zoo yuav xau hauv ib nrab teev.

3.Cov xim ntawm lub khob phab ntsa yog qhov zoo nkauj, yog li ceev faj kom txhob muaj kuab lom.Cov kws paub txog kev tswj xyuas kev ua tau zoo tau taw qhia tias cov khob ntawv feem ntau muab tso ua ke.Yog hais tias lawv tau ntub los yog muaj kab mob, pwm yuav tsis tsim nyog, yog li cov khob ntawv ntub dej yuav tsum tsis txhob siv.Tsis tas li ntawd, qee lub khob ntawv yuav raug luam tawm nrog cov xim zoo nkauj thiab cov lus.Thaum cov ntawv khob tau muab tso ua ke, tus number case nyob sab nraud ntawm lub khob ntawv yuav ua rau muaj kev cuam tshuam rau sab hauv ntawm lub khob ntawv qhwv ib ncig ntawm nws.Tus cwj mem muaj benzene thiab toluene, uas ua rau muaj kev phom sij rau kev noj qab haus huv.Yuav cov khob ntawv uas tsis muaj tus cwj mem lossis luam ntawv tsawg dua rau sab nraud.

4.Cov tuam txhab tsim cov khob ntawv txawv ntawm cov khob txias thiab khob kub, thiab lawv "txhua tus muaj lawv lub luag haujlwm."Cov kws tshaj lij thaum kawg tau taw qhia tias cov khob ntawv pov tseg peb feem ntau siv tuaj yeem faib ua ob hom: khob dej txias thiab khob dej kub.