Malcolm points out the irony in the White House having several official Twitter accounts, but blocking the service from its employees' computers.
Malcolm指出了白宫此举的讽刺性：一方面，白宫有一些官方账户，但是却禁止自己的雇员在自己的电脑上使用Twitter。
Synchronous - If the consumer crashes while blocking as the service runs, when it restarts it has no way of reconnecting to the invocation in progress, so the response is lost.
同步——如果使用者在服务运行的过程中阻塞时崩溃了，当它重新启动时，将无法重新连接到正在进行的调用，所以响应丢失了。
The second problem identified in the logging service example was the blocking of the service requestor process as a result of the synchronous message exchange protocol.
登录服务例子中发现的第二个问题是同步消息交换协议阻塞了服务请求者的处理。
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