Cov khoom siv ua ntej tus nqi thiab thawj-chav tsim khoom tsim tsis yog tsuas yog cov khoom siv tseem ceeb ntawm cov tuam txhab niaj hnub no, tab sis kuj yog qhov lav ntawm kev tsim cov khoom zoo.Peb lub tuam txhab txuas ntxiv mus yuav cov khoom siv ntau lawm, qhia cov ntaub ntawv tshiab, thev naus laus zis tshiab, kom cov khoom ntawmmini vibration motoryog serialized thiab tsim nyog.
