它采用的是一种特别的卡片式系统来显示打开的应用程序和图标，这允许我们在应用程序间方便的进行查看和转换。

It USES a special "card" system to display open apps and features, allowing a user to cycle through them easily and switch back and forth between apps.

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特别是，程序员必须显式地管理状态和状态之间的转换。

In particular, the programmer has to explicitly manage states and transitions between states.

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现在，我们理解了如何使用Android中的闭包，接下来更仔细地看看应用程序逻辑—特别是，如何执行单位转换计算。

Now that we understand how to use closures within Android, let's take a look at more of the application logic - in particular, how the unit-conversion calculations are performed.

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