private investment

例句：

1. 1.This is a private club that only members can enter.
   这是一个只有会员才能进入的私人俱乐部。
2. 2.He has a private office in the building.
   他在大楼里有一间私人办公室。
3. 3.The company's policy is to keep all information private.
   公司的政策是保持所有信息私密。