我心中那个不可告人的秘密，让我努力成为他最好的朋友。

My dark secret made me the best friend I'd ever been.

youdao

这里不可告人的秘密是，此现象致使许多编程人员实际上乐于 编写一些测试。

The dirty secret is that it turns out lots of programmers actually enjoy writing tests.

youdao

他看所有的东西都是深色的，而教民也认为他怀有不可告人的秘密或邪恶的想法不想暴露出来。

He now saw everything a bit more darkly, and they too imagined that he harbored dark secrets and dark thoughts too unpleasant to reveal.

youdao