plica membranae tympani externa posterior鼓膜: tympanic membrane后: behind; back; rear外: outside; external side襞: folds鼓膜后缩: retraction of tympanic membrane下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:鼓膜后外襞，即可在微信中查询翻译
