When there are multiple process instances, you need to be able to uniquely identify the process instance that returns the response.

存在多个业务流程实例时，需要能够唯一地标识返回响应的流程实例。

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If you pull apart a piece of lint carefully you will see that it is indeed composed of multiple colored threads; but as soon as you back away from it, the gray sensation returns.

如果你小心的扯开一团棉绒，你会发现他实际上是由多种颜色的线头组成。但你把它揉回去之后，看见的又是灰色。

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Creating a table function that returns multiple values isn't much more difficult.

创建返回多个值的表函数也不太困难。

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Disclosure of multiple years' tax returns is part of the answer here, but in this case it isn't sufficient.

CNN: Why won't Romney release more tax returns?

Yet filing tax returns in multiple nations and claiming foreign tax credits is an imperfect process that often results in tax mismatches.

FORBES: Swiss Tina Turner Giving Up U.S. Passport

You receive a K-1 from an MLP each year instead of a simpler 1099, and you may have to file returns in multiple states.

FORBES: Money & Investing