Science. 1971 May 28;172(3986):949-51. doi: 10.1126/science.172.3986.949.
The species Magicicada septendecim and Magicicada cassini of the 17-year cicada produce sound by sequentially buckling a series of stiff ribs embedded in a flexible tymbal. Each such collapse excites a damped oscillation in a resonant cavity. By this means the cavity (an abdominal air sac) is excited 10 to 12 times per muscle contraction, which permits a normal muscle to perform a task requiring very rapid repetitive activity.
十七年蝉和卡西斯蝉属的物种通过依次弯曲嵌入在鼓膜中的一系列硬肋来产生声音。每次这样的折叠都会在谐振腔内引起阻尼振荡。通过这种方式，腔体（腹部气囊）在每次肌肉收缩时被激发 10 到 12 次，这使得正常的肌肉能够完成需要非常快速重复活动的任务。
