A4
noun [ U ] uk/ˌeɪˈfɔːr/ us/ˌeɪˈfɔːr/
(英国标准的)A4纸(21 x 29.7厘米)
in the UK, paper that is a standard size of 21 centimetres by 29.7 centimetres
a sheet of A4 一张A4纸
A4 paper A4纸
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