emergency operation of the undercarriage应急: meet an urgent need; meet an ...放: release; set free; let go起落架: alighting carriage; landing ...的: 4次方是 The fourth power of 2 i ...操作: operate; manipulate; handle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:应急放起落架的操作，即可在微信中查询翻译
