订阅的目的是接收和处理选择的主题的消息。
The purpose of subscribing is to receive and process messages on the selected topics.
他们还必须能够有效地选择和处理信息，并努力从错误中吸取教训。
They must also select and process information effectively and seek to learn systematically from their mistakes.
它实际上是选择和处理XML文档中的内容的一种语法。
It's really a syntax for selecting and working with things in an XML document.
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