双回单,是双音节词回溯单音节词法的简称,是异于传统训释方法的、采用逆向思维方式解释古代汉语词语的新训释教学方法,它的重要基础是汉语中存在着大量可以互训的同、近义词。在教学和科研中这种方法运用广泛,《中古汉语读本》中同义词的组合、《说文解字》中同义词和同素反序词的组合都是运用的实例。 Double reversion is the abbreviation of double syllable words backtracking monosyllabic lexicon, which is different from the traditional method of interpretation and interpretation, and uses the reverse thinking mode to explain the new teaching methods of interpretation of ancient Chinese words. Its important basis is that there is a large number of Chinese Mutual training with the same, synonyms. This method is widely used in teaching and research. The combination of synonyms in Medieval Chinese Reader and the combination of synonyms and homologous anti-sequence words in Shuo Wen Jie Zi are all examples.