I'm really grateful for your presentation and the ocarina.
非常感谢您的讲座和带来的陶笛。
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。
The larger the air chamber of Ocarina is, the basic sound has lower pitch.
陶笛的共鸣气腔越大，其基本音就越低。
The larger the air chamber of Ocarina is, the basic sound has lower pitch.
陶笛的共鸣气腔越大，其基本音就越低。
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