Tub sab
Kev daws teeb meem txhais tau hais tias ib qho kev daws teeb meem uas siv (tshuaj lom neeg) cov khoom sib npaug tsis tuaj yeem tuav tau cov kev daws teeb meem ntau dua, thiab hais txog kev siv ntau yam tshuaj tshaj plaws hauv ib hom kuab tshuaj tshwj xeeb.