• 1. 向前复原: roll forward
• 2. 向前复原集: roll forward set
• 3. 向前错误复原: forward error recovery

• 1.他的身体非常弱，会向前跌倒，而且不能恢复原来的姿势，如果他向周围看，也会导致翻倒。
  His trunk would also get very weak and he would slump forward, unable to regain his posture more than a few degrees. If he looked around him he would almost certainly fall over.
  dict.yoduao.com

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