approach and landing aids进场: march into the arena approac ...着陆: landing; land; touch down保障: ensure; guarantee; safeguard进场着陆保障设备: approach-and-landing aids着陆保障系统: landing aid system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:进场着陆保障，即可在微信中查询翻译
