In a computing environment, there are typically lots of different resource types, and need different combinations. When the resources are provided and owned by many different parties, the efficiency of exchanging those resources become critical important.
在计算环境中，通常有许多不同的资源类型，并且需要不同的组合。当资源由许多不同的方提供和拥有时，交换这些资源的效率变得至关重要。