Kev nqes peev, tseem hu ua cov txheej txheem ploj-siv quav ciab, yog ib qho ntawm cov txheej txheem txheej txheem hlau ntev tshaj plaws, dhau los ntawm 5,000 xyoo dhau los. Kev nqis peev txheej txheem pib nrog kev txhaj tshuaj rau siv quav ciab ua rau siab ua kom tuag lossis nrog cov ntawv luam tawm sai. Cov ciab pa ...
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