Holding your hands in a cups for together and blowing thru the knuckles on your thumb.If you lift one finger to create an extra hole for wind to come out of the sound changes. <br/>手哨子就像瘋狂的bird.wav<br/>聲道：2<br/>類型：wav<br/>OWI、loop、pitched、weird、psychedelic、whistle、high、air、fast、dreamlike、pressures、hand、bird、crazy<br/>OWI、循環、傾斜的、奇怪的、迷幻、哨、高、空氣、快速、夢一般的、壓力、手、鳥、瘋<br/>資料來源：freesound ( https://freesound.org )