Cov khoom siv dej lim dej thiab cov khoom siv dej softening yog ob qho tib si cov cuab yeej kho dej, thiab lawv qhov sib txawv yog nyob rau hauv cov dej kho tau zoo.Cov khoom siv lim dej yog cov cuab yeej siv los ntxuav cov dej kom zoo, uas tuaj yeem tshem tawm cov khib nyiab, kab mob, kab mob, hnyav ...
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