It was written by an unknown author.
该书的作者是匿名的。
What if a book has an unknown publication date, or more than one author?
如果一本书有一个未知的出版日期，或者有多个作者，怎么办？
Often, when I am reading a good book, I stop and thank my teacher. That is, I used to, until she got an unlisted number. ~ Author unknown.
每当我阅读一本好书，总会停下来感谢我的老师。更确切地说，我过去常这么做，直到她换了电话号码，号码簿中找不到。
Endothelin receptor antagonists are known to have health benefit but precisely why was an unknown, said Pollock, corresponding author on the study.
内皮素受体拮抗剂，已知对健康有益，但具体机制不明确。
In my newspaper column some months ago, I reprinted a short essay on youth by Samuel Ullman, an author unknown to me.
数月前，笔者在敝报专栏转载了一篇论青春的短文，对作者塞缪尔·厄尔曼其人我并无所知。
In my newspaper column some months ago, I reprinted a short essay on youth by Samuel Ullman, an author unknown to me.
数月前，笔者在敝报专栏转载了一篇论青春的短文，对作者塞缪尔·厄尔曼其人我并无所知。
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