answer: May and Danny talk about the historical relics in the Hall of Ancient China.
documents: #Person1#: May, is this the Hall of Ancient China?
  #Person2#: Yes. Look at these historical relics here, amazing!
  #Person1#: Why are they all in glass boxes?
  #Person2#: For protection. Some relics will turn to dust if exposed to air.
  #Person1#: So there isn't air in the glass boxes?
  #Person2#: No, there isn't. They are all vacuumed.
  #Person1#: I wonder how old these things are, thousands of years?
  #Person2#: Yeah, they all come from a very ancient time.
  #Person1#: Hey, look at the three-leg cup. I've seen it on TV.
  #Person2#: The bronze cup was made 4, 000 years ago. It's priceless!
  #Person1#: Yeah, it has no value at all. Who will use this cup today?
  #Person2#: Danny, priceless means so valuable that you can't put a price on it.
  #Person1#: Oh, it does?