Question

anonymity

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an∙o∙nym∙i∙ty / ˌænəˈnɪmətɪ ; ˌænəˈnɪməti /
◙noun [U]
1. when other people do not know who you are or what your name is
• 匿名，姓名不公开:
 »Every step will be taken to preserve your anonymity.
  将采取各种措施确保不公开你的姓名。
 »One official, who spoke on condition of anonymity (=he would only speak if his name was not told), said the White House took the threat very seriously.
  一位不愿公开姓名的官员称，白宫很重视这一威胁。
 »the anonymity of city streets (=you do not know anyone, and no one knows you)
  城市街道上人人互不相识