Kev faib tawm ntawm cov khoom sib txawv
Cov ntsiab lus rhiab yuav raug faib ua ob hom raws li kev sib raug zoo ntawm cov tswv yim thiab cov khoom tawm: ib qho yog hom maj mam hloov, thiab nws cov teeb liab tawm tau nce zuj zus los yog tsawg dua nrog cov lus qhia nkag mus rau ntau hom; lwm qhov yog hom uas yog mutant. Nws muaj kev hloov pauv sai sai ntawm qhov nqaim ntawm lub suab teeb liab, nrog kev hloov me ntsis sab nraud ntawm qhov ntau. Cov kev cai tseem ceeb rau cov khoom siv rhiab yog: rhiab, ruaj ntseg thiab kev ntseeg siab, kev sib hloov pauv thiab kev rov ua dua tshiab, thiab qee qhov xwm txheej ntawm cov lus teb siab yuav tsum muaj.