Dialogue4

Daniel: May, is this the Hall of Ancient China?

May: Yes. Look at these historical relics here, amazing!

Daniel: Why are they all in glass boxes?

May: For protection. Some relics will turn to dust if exposed to air.

Daniel: So there isn't air in the glass boxes?

May: No, there isn't. They are all vacuumed.

Daniel: I wonder how old these things are, thousands of years?

May: Yeah, they all come from a very ancient time.

Daniel: Hey, look at the three-leg cup. I've seen it on TV.

May: The bronze cup was made 4,000 years ago. It's priceless!

Daniel: Yeah, it has no value at all. Who will use this cup today?

May: Danny, priceless means so valuable that you can't put a price on it.

Daniel: Oh, it does?