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
，
一条狭缝，气流从狭缝中磨擦而出。
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.
下唇和上齿，一条狭缝，气流从狭缝中磨擦而出。
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.
舌尖顶住上齿龈，阴住气流，然
移下舌尖，放出气流。
声明：以上例句、词性分类均由互联网资源自动
，
分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
