on a whim

 
  • 一时心血来潮

on a whim的用法和样例:

例句

  1. She bought that dress on a whim.
    她一时心血来潮就买了那件连衣裙。
  2. On impulse, I picked up the phone and rang my sister in Australia.
    我一时心血来潮,拿起话筒就给在澳大利亚的妹妹打了个电话。
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