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Nws yog cov txheej txheem sib xyaw ntawm cov xov paj nkhaus thiab cov xov paj ncaj.Qhov tib yam ntawm cov xov paj ncaj thiab nkhaus muaj plaub xim, cov xim ntawm cov nyom nyom yog ntuj tsim, cov tsos yog qhov tseeb thiab zoo nkauj.Lub simulation ntawm cov nyom yog siab thiab sib piv. nrog cov nyom ntuj.