The function of practicing tongue vibrato is: 1, promoting vocal cords? 2. cancel the participation of extralaryngeal muscles? 3. expand the scope? 4. a smooth transition?
Extended data:
Bilip vibrato is not common, and most languages are not regarded as independent phonemes. In Loko, there are vibrato of lips, such as [? Ulim] (face) The trill of the lips does not belong to the R-level sound.
Uvular trill mainly exists in European languages, such as French (with fricative tendency), German, northern Italy, some Dutch dialects, southern Norwegian dialects, Swedish, Aztec (a native Mexican language) and so on. In Oak language (some users), uvular trill and gingival trill will form a tiny pair, such as /π ari/ (cure) and /π a? I/(Oak)
Uvular trill also appeared in other languages, and was used by people with language barriers. They found it difficult to make gingival trills in the original language. Lenin used uvular trill in Russian.
References:
Tik Tok _ Baidu encyclopedia