Consider a simple list report that contains only the Product line level from one namespace and the Product type level from another namespace.
看看这样一个简单列表报告：报告只包含来自一个命名空间的Productline级别和来自另一个命名空间的Producttype级别。
The answer is to provide a more useful type of exception that also contains a lower-level exception. Listing 1 shows a simple ApplicationException that does just this
答案是提供一类更有用的异常，它还包含低级异常。
The pump impeller in welding, simple operation, stable work, welding effect to foreign similar type level.
该机专用于水泵叶轮的焊接，操作简单、工作稳定，焊接效果达到国外同类机型水平。
The pump impeller in welding, simple operation, stable work, welding effect to foreign similar type level.
该机专用于水泵叶轮的焊接，操作简单、工作稳定，焊接效果达到国外同类机型水平。
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