Larger air window of Ocarina will increase the frequency of basic sound.
加大陶笛的气窗，会使其基本音的频率提高。
To increase the thickness of material could improve the sound absorption property.
通过增加材料的厚度也可使吸声性能有较大提高。
To increase the thickness of material could improve the sound absorption property.
通过增加材料的厚度也可使吸声性能有较大提高。
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