between tree distance

例句：

1. 1. The book is between the two shelves.
   这本书在两个书架之间。
2. 2. They decided to meet between 8 and 9 o'clock.
   他们决定在8点到9点之间见面。
3. 3. The meeting was held between two representatives from different countries.
   会议是由来自不同国家的两位代表主持的。