thereby hangs a tale;there are wheels within wheels; there is far (/much)more to it than that C/than appears/than meets the eye) ; something (more) behind all this
? 他說(shuō) “劉軍長(zhǎng)的來(lái)電，你們看過(guò)了嗎？其中～！ ……”(杜鵬程 《保衛(wèi)延安》433) “Have you all seen General Lifts telegram?”he asked. “Quite a dissertation? …”/我覺(jué)得這件事背后可能～。I am inclined to think there i s something more behind all this.
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形容言談或文章十分令人費(fèi)解。hangs a tale,there is much finesse in ...,there is sth. behind all this, There is more to it than meets the eye.