如果研究一下JSF的标准生命周期，不难发现用户通常需要在Web页面上生成一个事件(比如，通过单击一个按钮)来调用GUI刷新。
If you check the standard life cycle of JSF, you will find that the user normally needs to produce an event on the Web page (by clicking a button, for example) to invoke the GUI refresh.
在我那可悲的生命里的每一秒钟都跟那个按钮一样毫无意义！
Every single second of my pathetic little life is as useless like the button!
当汽车第1次装上收音机时，我们就发现在行驶过程中旋转按钮手动调频会危及生命。
When radios were first put in automobiles, we all discovered that manually tuning an analog radio with a rotating knob while driving was dangerous to your health.
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