图标应当是 57 个像素的方角正方形。
Apple建议可单击的目标至少为44像素的正方形以获得最佳可用性。
Apple recommends that clickable targets be at least 44 pixels square for best usability.
AIRprint比正方形的纸巾盒还要小，里面放置了两个130万像素的摄像头和一个偏振光发射源。
Slightly smaller than a square tissue box, AIRprint houses two 1.3 megapixel cameras and a source of polarized light.
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