| 释义 | 
		fall·back AHD[fôlʹbăk'] D.J.[ˈfɔːlˌbæk]K.K.[ˈfɔlˌbæk]n.(名词)- Something to which one can resort or retreat.退路:某人可以凭借或隐退的某物
 - A retreat.退却
 
 - Computer Science A mechanism for carrying forth programmed instructions despite malfunction or failure of the primary device.【计算机科学】  低效运行,撤退:即使主要设备失灵或产生故障也能继续按编定的指令工作的机械
 
 - Something that falls back:降落物:the fallback of a huge explosion.一次大爆炸的降落物
 
  adj.(形容词)- Of, relating to, or constituting a resort or place of retreat:后退的,应变的:(组成)撤退的手段或地方的,与其有关的:a fallback proposal; a fallback position behind our own lines.撤退计划;在我们战线后的撤退地点
 
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