系统调用具有明确定义的接口，而且，通常可以方便地检测并处理调用机制——这是简单的部分。

A system call has a well-defined interface, and the calling mechanism can generally be easily detected and handled — that's the easy part.

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只要服务接口已经明确定义并有合适的粒度，EAI中间件就能确保满足soa的互操作性和位置无关性原则。

As long as service interfaces are explicitly defined and of appropriate granularity, EAI middleware can ensure that the interoperability and location independence principles of SOA are met.

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