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refined (รีไฟนด')
ค. ปราศจากสิ่งสกปรก, Adj. With impurities or
ซึ่งบริสุทธิ์ unwanted elements
having been removed
by processing
Other companies are converting the sludge into fuel. The heavy
metal problem appears to originate from the over use of highly
refined and processed toilet paper.
https://en.oxforddictionaries.com/definition/refined
