at whim, on the whim 心血来潮， 突发的念头，一时的兴致

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英语例句：

Carniestend to disappear on a whim, so his absence from the fair he'd been working atthat night didn't raise suspicions.

重点学习里面的whim 和 on a whim。

whim
/ˈwım/ noun , pl   whims [  count  ]
  : a sudden wish, desire, decision, etc.
   the whims of fashion
   It's hard to predict voters' whims.
   Her husband tries to satisfy her every whim. [=make her happy by doing everything that she wants]
   He quit his job on a whim. [=because of a sudden decision]
   The shop is only open at the whim of the owner. [=the shop is only open when the owner wants it to be open]

whim
whim / wim /

noun [C, U]
   a sudden wish to do or have sth, especially when it is sth unusual or unnecessary
   心血来潮；一时的兴致；突发的奇想:
   He was forced to pander to  her every whim.
   她每次心血来潮他都不得不依随她。
   We bought the house  on a whim.
   我们一时冲动买了这所房子。
   My duties seem to change daily  at the whim of the boss.
   我的职责似乎随着老板的兴致每天改变。
   the whims of fashion
   时尚的变化多端
   She hires and fires people  at whim.
   她随心所欲地雇用人和解雇人。

whim / wɪm ; wɪm /
◙noun [C]
1. a sudden feeling that you would like to do or have something, especially when there is no important or good reason
• 突发的念头，一时的兴致〔尤指没有重要或正当的理由时〕:
»on a whim
»I didn't leave just on a whim (=for no good reason).
  我不是一时心血来潮离开的。
»at the whim of sb
»At work they are at the whim of the boss.
  上班时他们要由着老板的性子。
»sb's every whim
»Their father had always indulged her every whim.
  他们的父亲总是对她百依百顺。
»at whim
»He appeared and disappeared at whim.
  他想来就来，想走就走。

当然，有很多类似意义的表达，比如，学会使用impulse，On impulse, I picked up the phone and rang her.  一时心血来潮，我拿起电话给她打了过去。
还可以使用urge，表示一时冲动。

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