private volume

例句：

1. 1.This is a private meeting between the CEO and the board of directors.
   这是首席执行官与董事会之间的一次私密会议。
2. 2. The private sector is responsible for 80% of the economy.
   私营部门负责经济总量的80%。
3. 3.He has a private library filled with rare books.
   他有一个私人图书馆，里面摆满了稀有书籍。