心心相印的英文：
[Literal Meaning]
heart/heart/each other/accord with
to have the same thoughts

[解释]
心：心思；印：符合、一致。佛教用语，彼此的心意不用说出，就可以相互了解。

[Explanation]
to have mutual affinity

[例子]
他们从小就是好朋友，彼此心心相印，长大后结成了夫妻。

[Example]
They had been good friends since they were young and had mutual affinity with each other. They got married after they grew up.

[英文等价词]
telesthesia

The hearts of our people accord with those of yours.
我们两国人民心心相印。

Their eyes met and they smiled at the same thought they shared.
他们心心相印地互视而笑。

Julia loved proteus as well as he did her
朱利娅和普洛丢斯心心相印，一往情深。