twin-duct aircraft双: two; twin; both; dual函: case; envelope道: road; way; route; path螺旋桨飞机: propeller-driven plane函道螺旋桨飞机: ducted-propeller aircraft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:双函道螺旋桨飞机,即可在微信中查询翻译