你知我知，天知地知

见“天知地知，你知我知”。

你知我知，天知地知

见“天知地知，你知我知”。

你知我知，天知地知nǐ zhī wǒ zhī , tiān zhī dì zhī

this is strictly between you,me and the gate-post
❍ ～，还有谁知道呢？我绝对不会对人家说的。(周而复《上海的早晨》 Ⅰ—121) This is strictly between you,me and the gate-post; not a soul knows besides us and I’d never breathe a word about it to anyone.