标准教程 Standard Course HSK5: Lesson 31 | Tiếng Trung HSK5: Bài 31 | Biaozhun Jiaocheng HSK5 | Chinese HSK5

标准教程 Standard Course HSK5 | Tiếng Trung HSK5 | Chinese HSK5 | Biaozhun Jiaocheng HSK5

标准教程 Standard Course HSK5: Lesson 31 | Tiếng Trung HSK5: Bài 31 | Biaozhun Jiaocheng HSK5 | Chinese HSK5

第三十一课: 登门槛效应
Lesson 31: Foot-in-the-door effect





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