an·o·nym·i·ty /ˌænəˈnɪməti/
  匿名,筆者不明
  An·o·nym·i·ty, n. The quality or state of being anonymous; anonymousness; also, that which anonymous. [R.]
     He rigorously insisted upon the rights of anonymity.   --Carlyle.
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  anonymity
       n : the state of being anonymous [syn: namelessness]