Horse 2008-3-22 20:48
旧托福听力mp3及脚本——《第三十六天》(2002年10月)
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W: Excuse me, I’ve been using this old book for a research project and I noticed that a lot of pages are turning brown and becoming brittle.:^1p U:Jz gY
M: Yes, unfortunately, that’s a common problem with books made from wood pulp.
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W: I suppose to make paper from wood that you have to add a lot of chemicals and acids to make it turn white.[.E_K+{,WG
M: Exactly and it’s the acid that eventually eats away at the paper.*mzLOfxA3q:A
W: Oh, that certainly makes sense, but this book’s not even 75 years old and I’ve seen books in museums that are hundreds of years old and they’re in fine condition.7p | Ut$l\4t%L
M: Well, you see, books have been made from wood pulp only since 1850, before that they were made from materials that were mostly animals’ skins or cloth-baste, no chemicals were added.
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W: It’s a shame those older wood pulp books are going to fall apart some day. Is there anything that can be done to preserve them.
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M: En, currently the only way to stop the books from decaying is to remove the binding and treat each page individually to remove the acid.k}'Irv f{&E
W: That doesn’t sound very economical.
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M: No, it isn’t. It’s not practical to treat a large number of books with this process, so we only try to rescue the most valuable 1st edition books in our collection.
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W: Well, thanks for the explanation. I’d better get back to my project.
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M: Good luck, and I hope the book holds up long enough for you to finish it.