Thaum mus tau nyuaj, cov ntsiav tshuaj rugged yog ib qho khoom siv ruaj khov thiab ruaj khov. Cov ntsiav tshuaj Rugged yog tsim los tiv thaiv ib puag ncig hnyav thiab kev xav tau. Lawv yog tsim los ntawm cov ntaub ntawv ruaj khov thiab muaj peev xwm tiv taus qhov kub thiab txias, av noo, plua plav, vibration, tee, thiab lwm yam nyuaj ...
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