必备特性 meaning in English

mandatory attribute
necessary traits

This concludes the second article in the jsf series , where i ve used a working example and three use cases to introduce you to the jsf request processing lifecycle and demonstrate some of the essential features of its component model
下面对这个jsf系列的第二篇文章进行总结：在本文中我们使用了一个范例和三个使用案例来介绍jsf请求处理的生命周期，并展示了其组件模型的一些必备特性。