在中世纪后期，人们习惯用磨料刮去羊皮纸的表面，把纸上的所有文字都擦得干干净净。
In the late Middle Ages, it was customary to scrape away the surface of the parchment with an abrasive, which completely wiped out any writing that was there.
羊皮纸很耐用，比纸耐用得多，而且方便的是它可以重复使用。
Parchment is durable, much more so than paper, and it could be reused which came in handy.
抄写员经常回收早期作为手稿用的羊皮纸。
The scribes often recycled the parchment that'd been used for earlier manuscripts.
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