bo'sn

例句：

1. 1.The book is about the history of the city.
   这本书是关于这座城市的历史。
2. 2.He bought a new car for his birthday.
   他为了生日买了一辆新车。
3. 3. They decided to go to the beach for their vacation.
   他们决定去海滩度假。