In teaching, we should pay attention both to it's phonetic value and retroflexed feature.
兼顾其音值的本质与卷舌的特点，才有利于教学。
A diacritical mark placed above a vowel to indicate a LONG. sound or phonetic value in pronunciation, such as ? In the word make.
长音一个发音符号，置于元音之上，表示长音或发音中的音值，如？在。
Q - the first letter of Chinese phonetic alphabet. 245 yield strength value.
Q—“屈”汉语拼音首位字母。245—屈服强度值。
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