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https://qooah.com/2013/12/02/nexus-7-%e5%8d%87%e7%b4%9a-android-4-4-%e4%b9%8b%e5%be%8c%e6%80%a7%e8%83%bd%e4%b8%8b%e9%99%8d/
Nexus 7 升級 Android 4.4 之後性能下降