Txawm hais tias cov khoom siv hluav taws xob zoo li cas, tsuav yog nws khiav ntau dua lossis tsawg dua, nws yuav tsim suab nrov, ces rau lub tshuab polishing, tsuav yog nws khiav, lub tshuab yuav ua suab nrov ntau lossis tsawg dua. Yog tias koj ntsib lub suab nrov no ntev, nws yuav hnov dhuav, tab sis kuj cuam tshuam ...
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