Ua ib lub tuam txhab muab khob iav uas muaj kev tshaj lij, peb muaj cov neeg siv khoom thoob plaws ntiaj teb, suav nrog lub teb chaws Yelemees, Asmeskas, Ltalis, Thaib, Nigeria, Mauritius thiab Saudi Arabia. Peb lub Hoobkas muaj ntau xyoo ntawm kev tsim khoom thiab txhim kho tas li. Peb cov khob iav yooj yim siv heev, tsis hais cov khoom siv twg los xij, tsuav yog lawv tuaj yeem kaw tau airtight. Tsis yog li ntawd xwb, lub khob iav tsis muaj kuab paug, zoo rau ib puag ncig, thiab yuav tsis ua rau lub teeb, cua sov thiab electromagnetic kuab paug. Ntxiv rau cov khob silicone, peb kuj tuaj yeem muab cov khob dej nqus, uas tsis tsuas yog nqus tau iav, tab sis kuj siv tau rau kev txav khoom xws li marble, phaj thiab vuas. Yog li, peb yuav yog koj qhov kev xaiv zoo tshaj plaws.