Kev lag luam xov xwm
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Yuav ua li cas tswj lub hnab lim?
Cov khoom siv hnab lim yog cov khoom siv ua kua uas siv tau siv hauv kev lag luam, feem ntau yog siv rau kev tshem tawm impurities thiab hais hauv cov kua. Txhawm rau tswj hwm nws cov kev ua haujlwm ruaj khov thiab txuas ntxiv nws lub neej pabcuam, kev txij nkawm ntawm lub hnab lim yog PA ...Nyeem ntxiv