一是已完成委托人协议 Worked Principal Agreement
Execute 方法用该池中的对象调用给定的委托，并且确保在该委托完成之后将检索到的对象返回到该池中。
The execute method invokes the given delegate with an object from the pool, and ensures that the retrieved object is returned to the pool after the delegate completes.
第二本书已经委托作者在写了，现已完成2/3。
A second book has already been commissioned and is two-thirds finished.
就在几天之前我完成了一项委托任务。
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