同字为训是古书训诂中以原字解释原字的一种释词方法。段玉裁《说文解字注·十四篇·已部》：《序卦传》：“蒙者，蒙也。”“比者，比也。”“剥者，剥也。”《毛传》日：“虚，虚也。”自古训放有此例，即用本字，不假异字也。以上前三例是以洲信的形式出现在经典正义中“随 The same word for the training is a method of explanation of the original word in the ancient books and precepts to explain the original word. Duan Yucai “Explain Word Explanatory Notes · Fourteen articles have been”: “Preface to the hexagrams”: “Mongolian, Mongolian.” “Than the ratio, too.” “Stripping, stripping also.” “Mao Biography ”Day:“ virtual, virtual also. ”Since ancient times this example, that is, with the word, not false words also. The above three cases are in the form of Chau letter in the classic justice "with