Timapereka mankhwala odalirika komanso apamwamba kwambiri a chitoliro, kuonetsetsa kuti palibe kutayikira chisindikizo, madera ofunsira akuphatikizapo: magalimoto, ankhondo, makina otengera mpweya, makina otulutsa injini, makina oziziritsa kuzizira ndi kutentha, kachitidwe ka ulimi wothirira, makina opangira madzi. mainjiniya), Tili ndi chikhalidwe chamakampani, chadzuwa, chowoneka bwino.