最直接的解决办法就是建立一套可以在不同“云”之间转移数据的统一标准。
The obvious answer is to establish agreed standards for moving data between clouds.
反过来，提供者自己的SLA也可以是与其它提供者签定的，每个SLA都有一套不同的需求、衡量标准和例外情况。
A provider, in turn, may have its own SLAs with other providers, each with a different set of requirements, measurement criteria, and exceptions.
在过去的几年，Web 服务提供了一套标准，该标准可以使运行于多种平台和技术上的完全不同的应用程序实现无间隙通信。
Within the last few years, web services have emerged to provide a set of standards that allow disparate applications running on a variety of platforms and technologies to seamlessly communicate.
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