Qhov sab caj npab stalled ntawm libong 926
Saib Ntau Dua
Txhim khu kev qha, ua tiav cov haujlwm ua tiav
Tsim los ntawm cov hlau zoo hlau, lub caj npab no yog engineed kom tiv thaiv hnyav thiab ua kom muaj kev siv sijhawm ntev. Tus qauv ntawm lub qhov caj npab yog kev tshawb fawb thiab tsim nyog, thiab nws tuaj yeem ua haujlwm tau zoo txawm tias nyob hauv qhov chaw nqaim ntawm cov av, nrog kev tsis muaj kev tso cai thiab hloov pauv.