[Mac] 键盘磨损 Key board wear off

在公司内部，普遍发现mac电脑键盘的a，n按键磨损严重，网上搜索之后发现，网友的键盘磨损也几乎都是a，n，i，z这几个，有些甚至在购买3个月后就出现磨损，请问这个现象的产生原因是什么？如果是正常使用磨损，不应该会出现如此高的一致性，按键的磨损应该是与使用习惯有关，会比较随机。

另，按键正常磨损的寿命是多少？以上现场是否属于普遍现象，是否为批量性质量原因，是否有改善制程的需要，请参考。

附件是我的键盘图片，我每个工作日需要使用电脑约10个小时，这个笔记本已经使用了超过一年。约半年前发现了a键的磨损，4个月前发现了n键的磨损。

A lot of colleges in our company use Macbook for work and we have noticed severe keyboard wear off on "a" and "n" keys. And after some research online, it seems like all of the Macbook keyboard wear off starts with "a", "n", "z", "I". And some of the wear off issue starts after using the Macbook for only 3 months. What are the possible reason for this issue? If it is caused by wear and tear, the consistency shouldn't be so high because it is related to the user's habit.

Please advise what is the lifetime of the keyboards? Whether the wear off is a common issue? Could this be a MP quality issue? Please take into consideration of any possible production process improvements.

Attached is a picture of my keyboard. I use the macbook 10 hours every workday for about 1 year and I noticed the "a" key wear off about 6 months ago and "n" hey wear off about 4 months ago.

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