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Open the tool →相知有素 (xiāng zhī yǒu sù) is a Chinese idiom (chengyu) meaning “to be old friends who have always understood each other well”.
相知有素 is pronounced xiāng zhī yǒu sù in Mandarin Chinese.
Literally, 相知有素 means “to have always known each other”. It is used to mean “to be old friends who have always understood each other well”.
素:向来。指一向互相了解的好朋友。