Kev txheeb xyuas kev tiv thaiv ib puag ncig ntawm cov khoom siv Kev tiv thaiv ib puag ncig ntawm cov yas ntim khoom kuj yog qhov teeb meem kev txhawj xeeb, uas tuaj yeem txheeb tau los ntawm kev ntxhiab tsw. Yog tias lub khob ua cov zaub mov-qib yas, qhov ntxhiab tsw yog me me, saum npoo yog qhov ci, tsis muaj burr, thiab kev pab lub neej ntev thiab tsis yooj yim rau cov hnub nyoog; yas zoo tib yam Los yog cov hnab yas siv dua tshiab muaj qhov tsis hnov tsw loj, tsaus xim, muaj ntau cov burrs, thiab cov yas yog yooj yim rau hnub nyoog thiab yooj yim tawg.
