by applying pressure you your fingers so that you knuckles would knack and make a poping sound 指關節crack.wav 聲道:2 類型:wav air、snap、crack、bones、snapping、human、OWI、knuckles、crunch、hand、cracking、pop、break 空氣、卡、裂紋、骨頭、捕捉、人的、OWI、關節、緊縮、手、開裂、流行的、打破 資料來源:freesound ( https://freesound.org )