虽然输入参数的语义与数据分布策略内的相同，返回值现在包含一个片标识的数组，而非单一一个片标识。
While the semantics of the input arguments remain the same as in the Data Distribution Policy, the return value now contains an array of slice identifiers instead of a single one.
如果您从事的是咨询业，也许文档和幻灯片就足够了，但是部署工作软件最终是大多数组织的目标。
If you are in consulting, then perhaps documents and slides are enough, but deploying working software is eventually the goal for most organizations.
过期数组中包含了一个时间片已经用尽的所有任务的有序列表。
The expired array contains a sorted list of all tasks whose timeslices have expired.
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