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
接触，形成一条狭缝，
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.
下唇和接触，形成一条狭缝，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.
舌尖顶住
，阴住，然
移下舌尖，放。
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