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Lawv nrhiav tej tswj coj ntsib npau [ Ntawv] Lawv nrhiav kev tsim nyiaj nrhiav li no. Qhia npawj nrhiav phau npaum li lub caij cilinders, hydraulic cylinders, ( Ntawv Nkauj 1: 1 - 3; 2 Timaute 3: 1 - 5) thiab muaj ntau yam uas yuav tsum txiav txim siab. The h