parchment imitation

例句：

1. 1. The ancient manuscripts were carefully preserved in the library.
   这些古老的手稿在图书馆里被小心地保存着。
2. 2.The parchment was so old that it had lost its original color.
   这张羊皮纸太旧了，已经失去了原有的颜色。
3. 3. He carefully unfolded the parchment and began to read.
   他小心翼翼地展开羊皮纸，开始阅读。