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The bilabial trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , and the equivalent X-SAMPA symbol is B\. In many of the languages where the bilabial trill occurs, it only occurs as part of a prenasalized bilabial stop with trilled release, . This developed historically from a prenasalized stop before a relatively high back vowel, such as . In such instances, these sounds are usually still limited to the environment of a following . However, the trills in Mangbetu may precede any vowel and are only sometimes preceded by a nasal. A few languages, such as Mangbetu of Congo and Ninde of Vanuatu, have both a voiced and a voiceless bilabial trill.〔(Linguist Wins Symbolic Victory for 'Labiodental Flap' ). NPR (2005-12-17). Retrieved on 2010-12-08.〕〔(LINGUIST List 8.45: Bilabial trill ). Linguistlist.org. Retrieved on 2010-12-08.〕 There is also a very rare voiceless alveolar bilabially trilled affricate, (written in Everett & Kern) reported from Pirahã and from a few words in the Chapacuran languages Wari’ and Oro Win. The sound also appears as an allophone of the labialized voiceless alveolar stop of Abkhaz and Ubykh, but in those languages it is more often realised by a doubly articulated stop . In the Chapacuran languages, is reported almost exclusively before rounded vowels such as and . ==Features== Features of the bilabial trill: In most instances, it is only found as the trilled release of a prenasalized stop. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bilabial trill」の詳細全文を読む スポンサード リンク
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