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A: May, is this the hall of ancient China? 

梅，这是古代中国馆吗？

B: Yes, look at these historical relics here, amazing! Why are they all in glass boxes?

是啊，看这些文物，真令人惊叹。

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

为了保护它们啊。一些文物暴露在空气中就会变成粉末。

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

那玻璃盒中没有空气了？

A: No, there isn't. There is a vacuum in every box. 

没有，它们都是真空的。

B: I wonder how old these things are. Thousands of years?

真不知道这些东西有多古老。几千年？

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

是啊，它们都来自古代。

B: Hey, look at the tripod. I've seen it on TV. 

看这个鼎，我在电视上看过。

A: It was made 4000 years ago. It's priceless!

4000年前的青铜鼎，这可是无价之宝！