Kutchetcha udzu wanu ndi ntchito yofunika kwambiri m'chilimwe, ndipo kudziwa momwe mungasamalire makina otchetcha udzu wanu kudzakuthandizani kuti mupitirize kugwira ntchito. Chimodzi mwa zinthu zofunika kwambiri pa makina otchetcha udzu ndi flywheel, yomwe ili mbali ya injini.
Ku China, tili ndi zibwenzi zambiri, kampaniyi ndi yokhutiritsa kwambiri kwa ife, khalidwe lodalirika komanso ngongole yabwino, ndiyofunika kuyamikiridwa.