A5       
noun [ U ] uk/ˌeɪˈfaɪv/ us/ˌeɪˈfaɪv/
 (英国标准的)A5纸(14.8 x 21厘米)
in the UK, paper that is a standard size of 14.8 centimetres by 21 centimetres
  a sheet of A5 一张A5纸 
 A5 paper A5纸 
 
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