4 txoj kev lifting saw yog ib qho kev tsim tshiab, los ntawm kev ua haujlwm zoo heev thiab cov khoom siv raw khoom zoo, kev ua haujlwm ntawm 4 txoj kev nqa saw hlau mus rau tus qauv siab dua. Peb zoo meej rau txhua qhov kev nthuav dav ntawm 4 txoj kev nqa cov saw , lav cov qib zoo, thiaj li coj koj cov khoom lag luam zoo meej. Lishenflex yog ib tug kws tshaj lij Tuam Tshoj 4 txoj kev nqa saw hlau chaw tsim khoom thiab cov chaw muag khoom, yog tias koj tab tom nrhiav qhov zoo tshaj plaws 4 txoj kev nqa nqa saw nrog tus nqi qis, sab laj nrog peb tam sim no!