the only copy extant;the only existing copy;unique copy ;
I got rare edition of the book for a song in the flea market.
我在跳蚤市场上以极低的价钱买到了这本书的孤本.
Two unique copies of ancient books were burned in the museum fire.
博物馆的两本古书孤本在火灾中烧毁了.
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