Flap
闪音
It refers to any sound produced by a single rapid contact between two organs of articulation (excluding vocal fold vibration). The usual occurrence of this is in the production of types of “r” sound, as when in English very the “r” is produced by the tip of the tongue in a flapped articulation against the alveolar ridge.
它指两个发音器官之间一次快速接触(不包括声带振动)而发出的音。常见于r类音的发音,如英语“非常”一词中的r,发音时舌尖对着齿薄隆骨作“一闪”的发音动作。