unprotected aircraft无: not have; there is not; be w ...飞: fly; flit安全: safe; secure; safety; securi ...设备: equipment; device; facility; ...的: 4次方是 The fourth power of 2 i ...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:无飞安全设备的飞机，即可在微信中查询翻译
