每个客人的资料都是高度保密的。

Měi gè kèrén de zīliào dōu shì gāodù bǎomì de.

Each guest’s information is strictly confidential.

这次的会议会保密进行。

Zhè cì de huìyì huì bǎomì jìnxíng.

This meeting will be held in strict confidence.

这次国家领导的行程保密。

Zhè cì guójiā lǐngdǎo de xíngchéng bǎomì.

The national leader’s itinerary is confidential this time.