Providing loose-coupling between service requestors and providers, the ESB allows for substitution of one service implementation with another, with no effect to the consumers of that service.
ESB 在服务请求者和提供者之间提供松耦合，允许用一个服务实现来替换另一个，而且不会对该服务的消费者造成影响。
It also simplifies maintenance and improves implementation testability by providing a single, unified log that spans between multiple service consumers and providers.
通过提供横跨多个服务消费者和提供者之间的单一、统一的日志，它同样也简化了维护并改善了可测试性。
SOA provides for the implementation, or realization, of services by service providers.
SOA通过服务供应者来提供服务的实现。
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