抛出活动允许您通知流程中出现问题。
A throw activity lets you signal that something has gone wrong in your process.
Dispose仍然会抛出异常，但并非总是会通知你某些事情发生错误。
Dispose can still throw, but it won't _always_ notify you that something went wrong.
Dispose仍然会抛出异常，但并非总是会通知你某些事情发生错误。
Dispose can still throw, but it won't _always_ notify you that something went wrong.
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