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Nyob hauv kev tsim kho ntawm qhov txawv ntawm qhov ua tau zoo yog tsawg tsawg, tib lub sij hawm tsis tsim qhov tshwm sim ntawm kev khiav haujlwm. Nws tuaj yeem ua raws li cov nplaim iav, los ntawm cov xim sib txawv ntawm iav iav kom zoo nkauj thiab zoo nkauj.