简要了解了case类和模式匹配之后，接下来让我们回到创建计算器ast的任务上。
Armed with that admittedly brief rundown of case classes and pattern matching, let's return to the task of creating the calculator AST.
如果您的操作系统是Mac OSX，那么您很可能使用过仪表板widget(计算器、天气、AppleiPod控制器)来完成某些特定的任务。
If you're using Mac OS X, you've probably used a dashboard widget (calculator, weather, Apple iPod controller) to complete some kind of specialized task.
你有一个自动运行杀手，任务管理器，计算器和文件浏览器，只有让你运行的文件，被列入甚至没有基本的上下文菜单。
You have an Autorun Killer, Task Manager, Calculator and file Explorer that only lets you run files, not even a basic context menu being included.
使用屏幕“计算器”执行基本的算数任务。
Performs basic arithmetic tasks with an on-screen calculator.
计算器黑客是这样一群小众：他们酷爱让手中笨拙的计算器执行那些有时显得稀奇古怪的任务。
Calculator hackers are a small band of enthusiasts who revel in making their clunky devices perform sometimes oddball tasks.
计算器黑客是这样一群小众：他们酷爱让手中笨拙的计算器执行那些有时显得稀奇古怪的任务。
Calculator hackers are a small band of enthusiasts who revel in making their clunky devices perform sometimes oddball tasks.
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