《明史·志·卷三十七》
宋代的胡瑗知道这个道理，所以四清声都减小它的直径以适应它。
宋胡瑗知此义，故四清声皆小其围径以就之。
Hu Yuan of the Song Dynasty understood this principle, so the diameters of the four clear sounds were reduced to adapt to it.
<s>[INST] 翻译: 宋胡瑗知此义，故四清声皆小其围径以就之。 [/INST] Hu Yuan of the Song Dynasty understood this principle, so the diameters of the four clear sounds were reduced to adapt to it.</s>
翻译: 宋胡瑗知此义，故四清声皆小其围径以就之。
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Hu Yuan of the Song Dynasty understood this principle, so the diameters of the four clear sounds were reduced to adapt to it.
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