retain a secret TEF/TCF常用TEF/TCF专四

保守秘密 newretain a secret的英文翻译是什么意思，词典释义与在线翻译：参考翻译保守秘密 retain a secret的用法和样例：例句He was put on his honour not to tell the secret.
他用人格担保保守秘密。I tell him the truth under a promise of secrecy.
我在他答应保守秘密之后把真相告诉了他。