但最先进的开发工具是“可教的代理”——一个计算机化的会学习、尝试、犯错和提问的角色，就像一个真实世界的学生。
But the most cutting-edge tool under development is the "teachable agent"— a computerized character who learns, tries, makes mistakes and asks questions just like a real-world pupil.
消费者总是向“管道”单元发送相同的消息结构，“管道”单元是真实服务的代理。
A consumer always sends the same message structure to the "pipe" brick, which is a proxy to the real service.
当调用者调用代理时，您可以在调用真实方法前，轻松添加您需要的任何定制特性。
When the caller invokes the proxy, you're free to add any custom features you may require before invoking the real method.
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