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
一条狭缝，气流从狭缝中
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，形一条狭缝，气流从狭缝中出。
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