digraph       
noun [ C ]  language specialized uk/ˈdaɪ.ɡrɑːf/ us/ˈdaɪ.ɡræf/
 二合字母(两个字母发一个音)
two letters written together that make one sound
  In English, the digraph "ph" is pronounced as /f/. 在英语中,二合字母 "ph "的发音为/f/。 
 See also: trigraph
 
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