2022-2023英语周报高一外研版第48期答案汇总

Surprisingly, finding hidden writing on very old 

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A group of second-year college students have discovered hidden writing on a page from a book from the 1500s, using a special camera system they built.

Surprisingly, finding hidden writing on very old documents isn’t all that unusual. In fact, there’s even a special name for documents like this: a palimpsest (再生羊皮纸卷).

Long ago, writing was done on parchment — thin, dried animal skins specially prepared for writing. But parchment wasn’t easy to make and wasn’t cheap. So it became common to erase the old writing off a parchment and then reuse it for another piece of writing. That’s what creates a palimpsest.

The writing erased off the parchment can’t be seen directly, but scientists have learned ways to use special lighting to reveal the original writing. But it’s unusual for young college students to discover palimpsests.