pseudonyms
n.
假名，化名，（尤指）笔名( pseudonym的名词复数 );
例句:
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But on newspaper websites, pseudonyms are allowed and are widely used.
但在报纸的网站上, 读者可用假名评论且普遍会这么做.
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All materials should bear the writer's name, address and phone number andbe published under pseudonyms.
文章可用笔名发表,惟投稿者须附真实姓名 、 地址及联络电话.
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But users hide behind avatars and pseudonyms.
来自WSJ
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The Earl's lawyer said the use of pseudonyms was to preserve anonymity.
来自THETIMES
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He has released several albums under pseudonyms including Stevia, Ebi, and others.
来自BBC