所以，以iPhone 8 (8, 7, 6S, 6)为例，其显示分辨率是750 x 1334 px ，如果设计师以显示分辨率的尺寸（转换率为@2x）做设计，而开发员需要转换率为@1x、@2x和@3x三种尺寸，那么设计师就需要先导出@1x的设计图，然后再切出@3x的图，这样就比较麻烦些。

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