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都是以来指示上文,表示以同格关系或内容说明的关系来修饰下文的固定词组。三者的基本意义相同,因而在很多情况下可以互换,如下面例句中的①②。但如果
Have all been used to indicate the above, indicating that the following fixed phrases are modified in the same context or in the context of the content. The three have the same basic meaning and are therefore interchangeable in many cases, as ①② in the following example. but if