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，条狭缝，气流狭缝中磨擦。

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.

尖顶住上齿龈，阴住气流，然后移下尖，放气流。