Qhov muag muag thiab ntsiag to ua rau lub tsev zoo li sov thiab xis nyob. Cov khoom siv hluav taws xob swb uas tau ua kom zoo dua los ntawm cov txheej txheem ntawm cov khoom siv swb yog qhov zoo heev hauv kev ua haujlwm. Nrog lub tog raj kheej hydraulic, t