心心相印 Heart to heart
Explanation
形容彼此思想感情完全一致，不用言语就能互相了解。
Describes the complete agreement of thoughts and feelings between two people who understand each other without words.
Origin Story
话说唐朝时期，有个才华横溢的书生叫李白，他与一位名叫杜甫的诗人相遇。两人初次见面便一见如故，谈笑风生。他们对诗歌的理解、对人生的感悟、对国家的忧虑，竟是如此相似。他们共同探讨诗歌的意境，吟诵着彼此心照不宣的诗句，仿佛心灵相通，不需要任何语言就能完全理解对方的想法。后来，他们成为了一生的挚友，共同谱写了唐朝诗歌的辉煌篇章。他们的友谊，便是心心相印的最好诠释。他们的诗歌，至今仍流传于世，也成为了心心相印的典范。
It is said that during the Tang Dynasty, there was a talented scholar named Li Bai who met a poet named Du Fu. The two hit it off immediately and chatted animatedly. Their understanding of poetry, their insights into life, and their concerns about the country were surprisingly similar. They discussed the mood of poetry together and recited lines to each other that they both understood, as if they were mentally connected and could understand each other's thoughts without words. Later, they became lifelong friends and together wrote a brilliant chapter in Tang poetry. Their friendship is the best proof of their heart-to-heart connection. Their poems are still passed down to this day and are an example of this connection.
Usage
形容双方思想感情完全一致，彼此了解。多用于褒义，形容亲密关系。
Describes the complete agreement of thoughts and feelings between two people who understand each other. Mostly used in a positive sense, to describe intimate relationships.
Examples
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两位老友久别重逢，心心相印，感慨万千。
liǎng wèi lǎoyǒu jiǔ bié chóngféng, xīn xīn xiāng yìn, gǎnkǎi wàn qiān.
Two old friends who had been separated for a long time met again, their hearts resonated, and they had many feelings to express.
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他们心心相印，合作默契，共同完成了一项伟大的事业
tāmen xīn xīn xiāng yìn, hézuò mòqì, gòngtóng wánchéng le yī xiàng wěidà de shìyè
They were of one mind and cooperated tacitly, accomplishing a great undertaking together