The abstract base class has a member TreeItem that will be an instance of the TreeItem widget in GWT and will be the client data with which the callback is associated when the callback class is used.

抽象基类有一个成员TreeItem，它是GWT中TreeIte m部件的实例，包含客户机数据，在使用回调类时回调与这些数据相关联。

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The Data Abstract Layer consists of a single class to provide location-related data to the business layer (see Figure 3).

数据抽象层包含一个类，用于向业务层提供关于位置的信息（请参见图 3）。

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Abstract: Recently, the problem of Class-imbalance has become a hotspot in machine learning and data mining.

摘要：最近在机器学习和数据挖掘上，非平衡类问题成为了一个研究热点。

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Class types often are referred to as abstract data types.

类类型经常会涉及到抽象数据类型。

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Class types often are referred to as abstract data types.

类类型经常会涉及到抽象数据类型。

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