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https://tlcheng.wordpress.com/2019/01/25/android-android-sdk-tools-25-2-5-%e7%84%a1%e6%b3%95%e7%a7%bb%e9%99%a4-xamarin-for-vs2017/
[Android] Android SDK Tools 25.2.5 無法移除 – Xamarin for VS2017