The only existing copy; the only copy extant

• 孤本

The only existing copy; the only copy extant的用法和样例：

例句

1. We have a unique copy of the book.
   我们有这书的孤本。
2. He said it was the only Hui-style miniature garden in existence.
   说它是徽派袖珍园林的一个孤本。