Cov khoom siv tsis tu ncua yog qhov tsim tshiab, los ntawm cov ntaub ntawv siv tau zoo heev thiab cov khoom siv raw zoo nkauj, kev ua tau zoo ntawm cov khoom siv passive breakive . Peb zoo tag nrho rau txhua qhov kev nthuav dav ntawm cov khoom siv passive chanctive , lav theem ua tau zoo, yog li coj koj cov khoom zoo tshaj plaws. Mecanmed yog tus kws tshaj lij Suav teb cov khoom tsis lag luam tu ncua