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a shot in the arm是什么意思

a shot in the arm

例句

用作名词(n.)
  1. Your encouraging words were a real shot in the arm.你对我的鼓励真是一针兴奋剂。
  2. There wasn't that much fighting in the lunches.午饭时也有战斗,他们是很好的兴奋剂。
  3. It was then countered with the biggest stimulus in history.然后以史上最大的刺激因素对其进行了反击。
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