NAME OF A PERSONwhen other people do not know who you are or what your name is 匿名,不公开姓名
Every step will be taken to preserve your anonymity.
将采取各种措施确保你的姓名保密。
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,白宫非常重视这一威胁。
the anonymity of city streets (=you do not know anyone, and no one knows you)