a deep secret

• 严守的秘密

a deep secret的用法和样例：

例句

1. She can talk about the things she had to keep secret because her readers did not want their pleasure spoiled by knowing how things would turn out.
   罗琳可以谈论那些曾经要严守的秘密了，因为在此之前读者不想因事先知道故事情节而读起来索然无味。