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Ntawm thaj av, qee cov ntses ua liaj ua teb tau siv cov txheej txheem rov ua dua tshiab los siv lawv cov dej. Cov txheej txheem rov ua haujlwm siv 100 npaug dej tsawg dua ib kilo ntawm ntses dua li cov txheej txheem hauv av. Tsis tas li ntawd, cov dej zoo tuaj yeem saib xyuas tsis tu ncua, uas txo qhov kev pheej hmoo ntawm cov kab mob thiab kev xav tau tshuaj tua kab mob.

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