beat the air

英 美
  • vi. 与幻想之敌作斗争(作无益的斗争;白费力气;徒劳)
    用作不及物动词 (vi.)
    1. He was really just ploughing the sands.
      他不过是在白费力气。
    2. To argue with such a marl is like beating the air.
      跟这号人辩论是白费力气。

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