a repeated short, high sound made, for example, by somebody’s voice or by a bird （人的）颤声，短促尖声；（鸟的）啼啭，唧唧啾啾 - (
music 音乐 the sound made when two notes next to each other in the musical scale are played or sung quickly several times one after the other 颤音 - (also roll)(
phonetics 语音学 a sound, usually a /r/, produced by making the tongue vibrate against a part of the mouth 颤音
Word Originmid 17th cent.: from Italian trillo (noun), trillare (verb).