音标发音英式音标 [ˌeɪˈfɔːr]美式音标 [ˌeɪˈfɔːr]英式发音 美式发音 基本解释（英国标准的）A4纸（21 x 29.7厘米）。同根派生 A4相关词英汉例句noun [ U ]a sheet of A4 一张A4纸A4 paper A4纸A4更多例句英英字典剑桥英英字典 in the UK, paper that is a standard size of 21 centimetres by 29.7 centimetresA4剑桥字典A4柯林斯字典