cover leaf

例句：

1. 1. The book has a beautiful cover leaf that adds to its appeal.
   这本书有一个漂亮的封面叶，增加了它的吸引力。
2. 2.The writer used the cover leaf as an additional layer of protection for the manuscript.
   作者使用封面叶作为手稿的额外保护层。
3. 3.The library has a collection of rare books with unique cover leaves.
   图书馆收藏了一本本稀有书籍，每本书都有独特的封面叶。