单词：aback 

副词

• 
  [1.r.aback] (同义词:[aback( adv. 向后地 )]  )
• 
  注释列句：having the wind against the forward side of the sails; "the ship came up into the wind with all yards aback"
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  [2.r.aback] (同义词:[aback( adv. 向后地 )]  )
• 
  注释列句：by surprise; "taken aback by the caustic remarks"