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
齿接触，形成一条狭缝，气流从狭缝中磨擦而
。
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.
下唇和齿接触，形成一条狭缝，气流从狭缝中磨擦而。
It is pronounced by raising the tongue tip against the upper teethridge to block the air and then putting it down to release the air.
顶住齿龈，阴住气流，然
移下，放气流。
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