internal centerless grinder

例句：

1. 1.The company's headquarters are located in the heart of the city.
   这家公司的总部位于市中心。
2. 2. The book is about the history of the United States.
   这本书是关于美国历史的。
3. 3.The interior design of the house is beautiful.
   这所房子的内部设计很美。