This limitation derives from the fact that most touch-screen displays today use a single sheet of glass as the top layer.
这一局限性源自这样一个实际情况，那就是如今的大多数触屏显示器最表层单有一片玻璃。
The only difference will be screen size which isn't really a limitation.
唯一的区别就是屏幕尺寸，但这不是问题。
An unwanted graphic, usually small, that remains on a screen after an image is distorted by a mistake, omission, or limitation in graphics software or hardware.
由于错误、删除或图形软硬件中的局限性，而使图像失真以后留存在屏幕上的一种不想要的图形，通常很小。
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