Kev kho saum npoo
Kev kho deg yog ib qho txheej txheem ntxiv siv rau saum npoo ntawm cov khoom siv rau lub hom phiaj ntawm kev ntxiv cov haujlwm xws li xeb thiab hnav tsis kam lossis txhim kho cov khoom zoo nkauj los txhim kho nws cov tsos.
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