operating class

• 1. 操作类别: operating class | action type | action category

• 1.类别只提供操作，不提供属性。
  A category may only provide operations, not attributes.
  dict.yoduao.com
• 2.当然，在您开始实际使用并操作树时，您可能会发现这些类别的其他许多有趣的组合和扩展。
  Of course, you may find many other curious combinations and extensions of these categories as you begin to use and manipulate trees in practice.
  dict.yoduao.com
• 3.还可以使应用程序能够操作与库关联的类别。
  It also enables applications to manipulate the categories associated with a library.
  dict.yoduao.com

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