两颗心都心照不宣两个人都形影不离
[liăng kē xīn dōu xīn zhào bù xuān liăng gè rén dōu xíng yĭng bù lí]
Echoes a similar sentiment as '有两颗心叫心照不宣有两个人叫形影不离', reiterating the concept of unspoken understanding and constant companionship. It signifies the bond between two people who understand each other deeply without words and remain inseparable.