/ˈnæʃənl ˈsiːkrɪt/ – Phrase
Definition: Thông tin mật quốc gia.
A more thorough explanation: sensitive information that is known only by a country’s government and some of its officials, and needs to be kept secret from outsiders
Example: A person who participates in mediation shall keep confidential any national secret, trade secret, individual privacy, or any other information inappropriate to be disclosed.