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.
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。
To avoid confusing non-administrative users, we added a mechanism to suppress the default links in the left navigation menu.
为避免给非管理员用户造成混乱，我们添加了一个机制来在左边导航菜单中去除缺省链接。
The EMF provides a generic navigation model for the graph or related (or unrelated) objects, and contains a built-in change notification mechanism.
EMF 提供了用于图表或相关（或不相关）对象的通用导航模型，并且包含了一个内置的变更通知机制。
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