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.
和上齿接触，形成一条狭缝，气流从狭缝中磨擦而出。
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.
和上齿接触，形成一条狭缝，气流从狭缝中磨擦而出。
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