不允许删除最后一个管理员工作项，这是因为相应的实例对象必须保持能够管理。
You are not allowed to delete the last administrator work item, since the corresponding instance object must remain manageable.
按照这个范例在你的Rakefile中实例化一个Rake：RDocTask对象将会建立一系列Rake任务，用于创建、删除及重新构建你的文档。
Instantiating a Rake: : RDocTask object within your Rakefile as per this example will create Rake tasks to build, delete and rebuild your documentation.
接收到已删除业务对象并进行转换后，将转换标识符，然后禁用实例。
When a deleted business object is received and transformed, the identifiers are converted, and then the instance is deactivated.
接收到已删除业务对象并进行转换后，将转换标识符，然后禁用实例。
When a deleted business object is received and transformed, the identifiers are converted, and then the instance is deactivated.
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