How to: Create User-Defined Exceptions.
如何：创建用户定义的异常。
This is true for all built-in exceptions, but need not be true for user-defined exceptions (although it is a useful convention).
对于所有的内置异常都是如此，不过用户自定义异常就不一定了(尽管这是一个很有用的约定)。
Exceptions cannot be used as data members of user-defined types.
异常不能当作用户定义类型的数据成员使用。
The thresholds are defined in a threshold set, which is a list of Periodic Exceptions performance counters.
阈值在一个阈值集中定义，它是一个定期异常(Periodic Exceptions)性能计数器列表。
We can process both types of exceptions, the threshold exceptions that are user-defined and the event exceptions for deadlocks.
我们可以处理两种类型的异常：用户定义的阈值异常和针对死锁的事件异常。
Some exceptions are common and have been grouped into a set of pre-defined or system exceptions.
有些常见的异常被合并到一组预定义的异常或系统异常中。
The exceptions were described and defined.
对这些例外情况进行了描述和定义。
The national secrets, administrative secrets and private secrets should be accurately defined and make clear that they will be three major exceptions that will not be open to the public.
应准确界定国家秘密、行政秘密和私人秘密的范围，作为免于公开的三大事项。
The national secrets, administrative secrets and private secrets should be accurately defined and make clear that they will be three major exceptions that will not be open to the public.
应准确界定国家秘密、行政秘密和私人秘密的范围，作为免于公开的三大事项。
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