The trouble with this approach is that your message handler is called many times to notify you of events that are not relevant for your plug-in.
这种方法的弊端是，消息处理程序将被多次调用来向您通知事件，而这些事件可能与您的插件无关。
Note: If you're having trouble with this task, there is a sample plug-in download that has all the models already made for you.
注意：如果您在执行此任务时遇到问题，您可以下载一个样例插件，此插件为您准备好了所有模型。
If that seems like too much trouble to do manually, the rails_iui plug-in contains a set of Rake tasks that will download and install iui, including changing the URLs in the CSS file.
如果觉得手工完成这些步骤比较复杂，可以使用rails_iui插件所包含的一组Rake任务，它可以下载并安装iui，包括在CSS文件中更改url。
Construction personnel must not in order to meet household only change at the switch and the plug wire, otherwise they will be electricity for households later buried safe hidden trouble.
施工人员千万不能为了应付住户而只换换开关和插头处的电线，否则会给住户以后用电埋下安全隐患。
The plug-up of the crude oil gathering line due to wax condensation is a common trouble occurring in the oil field.
油田集油和输油管线冻（凝）堵是油田生产常见故障之一。
The plug-up of the crude oil gathering line due to wax condensation is a common trouble occurring in the oil field.
油田集油和输油管线冻（凝）堵是油田生产常见故障之一。
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