Flapping

is whirring, you scattered the dark mist that lay before your eyes and, flapping your wings, you whirled about, and through this world you brought pure

Evolution”. Cambridge: Cambridge University Press Do the Power Requirements of Flapping Flight Constrain Folivory in Flying Animals? R. Dudley, G. J. Vermeij Functional

词中后跟n或r的/ə/脱落 - int(e)restin(g), import(a)n(t), diff(e)ren(t) 英语中弱化与连音的结合以及闪音化（英语：Flapping）等音变造成了英语中的各种简称（英语：Wikipedia:List_of_English_contractions）和松弛发音现象。反应松弛发

有殼翼足亞目（学名：Thecosomata），又名披殼亞目，亦稱為海蝶（Sea butterflies）或振翅蝸牛（flapping snails），為分類學亞目的海生蝸牛。她們為終生浮游（holoplanktonic）軟體動物門腹足綱的後鰓目中。 此分類以往被稱為翼足類（pteropods）。此名

"Scapular orientation in theropods and basal birds, and the origin of flapping flight." Acta Palaeontologica Polonica, 51(2): 305–313.PDF fulltext （页面存档备份，存于互联网档案馆）