名词
中文翻译：对称二义图
同义词：
['symmetry digraph', 'symmetric digram']
例句：
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1.The symmetry digraph of the alphabet is a key to understanding the structure of language.
字母的对称二义图是理解语言结构的关键。
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2. In the study of phonetics, the symmetry digraph is used to represent the sound of a single letter.
在语音学研究中，对称二义图用于表示单个字母的发音。
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3.The symmetry digraph of the word "apple" is used to indicate that the first letter of the word is pronounced as "a" and the second letter is pronounced as "p".
单词“apple”的对称二义图是用来指示第一个字母读作“a”，第二个字母读作“p”。