今天这一家人来到印第安纳州（Indiana）。他们正在参观印第安纳波利斯儿童博物馆（Children’s Museum of Indianapolis），一位讲解员在讲解。
Guide: This is the largest children’s museum in the world. Over 1 million people visit the Children’s Museum of Indianapolis each year.
Claudine: Sam and I obviously aren’t young children, so is there anything here that we’d enjoy?
Guide: Absolutely. We have a planetarium and a carousel that people of all ages enjoy.
Gina: Are there any exhibits that are particularly interesting?
Guide: We have a permanent exhibit featuring three famous children and the impact they had on the world. People seem to enjoy that exhibit quite a bit.
Paul: Do other exhibits rotate?
Guide: Yes. We have many rotating exhibits, and we are constantly thinking up ideas forinnovative exhibits in the future. Let’s get started on the tour, and I can answer your questions along the way.
A carousel (也叫a merry-go-round) ：转马（一圈固定在地面转盘上的彩色木马，人骑在上面随转盘转动，有时木马边旋转，边上下起伏。）
An exhibit (或exhibition) ：展览，展品
Permanent ：永久的。A permanent exhibit指博物馆的常设展。
在这个对话中，动词 to rotate的意思是定期轮换。A rotating exhibit指博物馆中轮换陈设的展品