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
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.
下唇和齿接触，形成一条狭缝，气从狭缝中磨擦而出。
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.
舌尖
齿龈，阴气，然
移下舌尖，放出气。
：以
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