It is pronoumced by raising the tongue tip against the upper teethridge to block the air and then putting it down to release the air.
下唇和上齿接触，形成
缝，气流从缝中磨擦而出。
It is pronoumced by raising the tongue tip against the upper teethridge to block the air and then putting it down to release the air.
下唇和上齿接触，形成缝，气流从缝中磨擦而出。
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