单词	ammonium persulfate
释义	ammonium persulfate noun : a colorless crystalline salt (NH4)2S2O8 used as an oxidizing agent and for improving dense photographic negatives Word History First Known Use 1891, in the meaning defined above
随便看	ketupa Ketuvim ketyl Keuka Lake Keuper keur keurboom keurbooms keV kevalin kevazingo kevel kevels kevils kevlars Kew kew weed kewasinga kewasingo Keweenaw Peninsula Keweenawan Kewpie kewpies kex kexes

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