It's okay. Erhu ruyi refers to the ruyi of the erhu teacher, who studied with the famous erhu player and the chief of Shandong Song and Dance Theatre since childhood. Graduated from Shanghai Conservatory of Music, studied under the famous Erhu educator Wu Zhimin during the university period, and studied under the famous Erhu educator Wang Yongde for graduate students. Now he is the tutor of master students in folk music department of Shanghai Conservatory of Music. Lu Shanshan, a young erhu player, graduated from the Central Conservatory of Music with a master's degree in erhu. Learn from Mr. Zhu Jiangbo and Mr. Xue Ke. They don't study in the same school or the same teacher, so it doesn't matter.