Xiao Pan, look at these two documents. One is new, and the other is very old.

I can tell. This one has turned a little yellow, and it has a slight smell.

Right. That's because it's been around for a long time and the air is very humid. Paper can easily deteriorate under these conditions.

I see. It's also very humid in Hue, and books can become like this too.

That's why we need to keep important documents in a dry place and organize them by category.

Are these old documents very important?

Yes. Some of them are documents from many years ago and are very useful for historical research.

I understand. Protecting documents means protecting history.

Very well said. This is especially important when working with culture and heritage.