常规不是那种秘传的东西但确实是冥想的秘诀。

Routine isn't that esoteric but it is the secret to meditation.

youdao

秘传的，神秘的，难懂的。

Difficult to understand. Also: of special or unusual interest.

youdao

我问了，但是他说他不能告诉我那药方，因为那是秘传的。

I asked, but he said he couldn't tell me the recipe because it was esoteric.

youdao

That's not to say that the Chinese don't have an esoteric form of musical notation, that the Indians do not have an esoteric form of musical notation.

这不是说中国人,没有秘传的记谱方法,也不是说印度人,没有秘传的记谱方法

耶鲁公开课 - 聆听音乐课程节选