我将构建一个简单的计算器应用程序，逐步改进它的外观和感觉，修改它的结构来添加依赖性注入，以及实现JSF的导航机制。
You build a simple calculator application and, in subsequent iterations, improve its look and feel, modify its structure to add dependency injection, and implement JSF's navigation mechanism.
最受装置收藏家推崇的设备之一，CURTA计算器是一台现代差分机——一台能进行高精度计算的全机械结构计算器。
One of the devices most prized by gadget collectors, the Curta Calculator is a modern Difference Engine - an entirely mechanical calculating machine capable of great precision.
早期的设想是用计算器来计算包括截止阀和换色涂抹装置在内的仪器，然而这项设计最终才用了自动弹跳机理结构，原因是易于操作。
Early ideas to counter these issues included cut-off valves and colour-changing paint, but the designer settled on the pop-up mechanism, because of its ease of use.
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