Tsim nrog kev coj tus kheej zoo tshaj cov hlau
Cov qauv tsim, ruaj thiab tsis yooj yim rau deform, zoo load kuj.
Cov kabmob hlau cov khoom siv
Cov cuab yeej siv cov kabmob steel muaj kev ua haujlwm zoo thiab tsis yog yooj yim xeb.
khoom lag luam khoom lag luam khoom zoo
Cov kev coj tus kheej hnav-nrawm nrawm yog ruaj khov, tsis tshua muaj suab nrov thiab tsis tshua muaj kev sib txhuam, txhim kho kev tiv thaiv kev nyab xeeb.