secret code

A set of symbols, numbers, or words used to conceal information or restrict access, often requiring a specific key or password to interpret or unlock.

• 🇨🇳用于隐藏信息或限制访问的一组符号、数字或词语，通常需要特定密钥或密码才能解读或解锁。

1. Confidential communication system B2 formal

   A set of symbols, rules, or signals used to transmit information in a hidden or encrypted form, accessible only to those who know the method.

   • The spies communicated using a secret code that changed daily.
   • The children invented a secret code to pass notes in class.
   • The ancient manuscript was written in a secret code that took years to decipher.

   🇨🇳密语

2. Personal or group password A2 informal

   A private word, phrase, or sequence used to gain access to something or to identify oneself as a member of a group.

   • The club members used a secret code to enter the meeting room.
   • He whispered the secret code into the intercom to open the gate.
   • They agreed on a secret code to use if they were in danger.

   🇨🇳密码