private communication channel

例句：

1. 1. This is a private meeting between the two leaders.
   这是两位领导人之间的一次私下会晤。
2. 2. The company has a private club for its employees.
   该公司为员工设有一个私人俱乐部。
3. 3. He prefers to keep his business dealings private.
   他更喜欢保持商业交易的私密性。