Tech
[MacBook] macbook air 刚买三个月，屏幕上就开始出现键盘痕迹了，是不是得买个硬质内胆包或专用的电脑包？
没有键盘膜，日常用普通背包每天背来背去
屏幕上应该是键盘印子（主要是键盘和触控板之间的那一道，用手电筒照亮屏幕后才能看到）
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