Hauv kev tsim cov ntawv hlau, cov txheej txheem ntawm kev tsim cov duab kos duab tshiab, suav nrog kev txiav cov qauv tiaj tus, khoov cov duab kos, thiab tsim cov duab kos, yog qhov tseem ceeb rau cov laj thawj hauv qab no: 1. Kev tsim khoom thiab kev ua kom zoo: Kev tsim cov duab kos tsis tas yuav raug txhais ncaj qha ...
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