An ESB can coordinate synchronous or asynchronous services, and in fact can provide both synchronous and asynchronousaccess to the same service.
ESB能够调节同步或异步服务，事实上对于同一服务可以提供同步及异步的访问。
2
These include a provision to specify the transport protocol, which is needed to access the service, and a clearer method of declaring both synchronous and asynchronous services.
这包括指定访问该服务所需的传输协议的规定，声明同步和异步服务的更明确的方法。
3
You've seen various ways to access services from both SCA and non-SCA Java components -- and the various error handling mechanismsm asynchronous programming model and various asynchronous calls.