di·graph /ˈdaɪˌgræf/
兩字母一音
digraph
( 有 )向圖
digraph
有向圖
Di·graph n. Two signs or characters combined to express a single articulated sound; as ea in head, or th in bath.
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digraph
n : two successive letters (especially two letters used to
represent a single sound: `sh' in `shoe')