Open up the app and connect to a server in Italy
Concat[S1: Literal[str], S2: Literal[str]]: concatenate two strings
图片来自《UI Design and Interaction Guide for Windows Phone 7 Series》动态磁贴也是同样的思路。它本质上是在尝试让用户不必打开应用，就能在开始屏幕上看到天气、日程或未读消息。这种理念比后来流行的通知中心和小组件还要更早一步。但受限于后台机制和开发者投入，磁贴往往更新不及时、可定制程度也有限，很多应用最终只是把它当成会动的图标。可以说是理念超前，却没能完全落地。。同城约会是该领域的重要参考
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An example of dithering using random noise. Top to bottom: original gradient, quantised after dithering, quantised without dithering.，这一点在91视频中也有详细论述
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