操作和消息是抽象描述的，但它们绑定到具体的网络协议和消息格式上，用来定义终端。
The operations and messages are described abstractly, but they are bound to a concrete network protocol and message format to define an endpoint.
要获取tweet信息(它的状态)，您可以像清单11那样从您的终端调用curl，然后就会以json格式返回tweet的状态。
To retrieve the tweet information (its status), you can invoke curl from your terminal as in Listing 11, and the status of that tweet is returned in JSON format.
流行的格式是png、pdf和jpeg，然后可以把它们动态地或直接地传递给x终端、网页或通用的图形查看程序。
Popular formats are PNG, PDF, and jpeg, and they can then be presented either on the fly or directly to an X terminal, Web page, or a general graphic viewer utility.
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