dummy run       
noun [ C ] UK informal uk/ˌdʌm.i ˈrʌn/ us/ˌdʌm.i ˈrʌn/
 (同dry run)
a  dry run 
  The local elections can be seen as a dummy run for the national election next year. 当地的选举可被视作明年全国选举的预演。 
 
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