Wherever you're tempted to copy code from one class to the next, stop and consider how you can use class hierarchies to leverage similar or identical functionality.
无论何时，如果想将代码从一个类复制到下一个类中，请停下来并考虑如何使用类层次结构利用类似功能或相同功能。
To accomplish this, create a ListBox widget class similar to the one created earlier for TextField, and then add select() and find() methods to it.
要完成这项操作，需要创建ListBox 窗口小部件类，创建过程与前面创建TextField的相似，然后将select()和find()方法添加到该类中。
Every Joda class has a constructor, similar to this one, where you specify all of the fields that the Joda class can hold.
每一个joda类都有一个与此类似的构造函数，您在此构造函数中指定joda类可以包含的所有字段。
Sometimes, you might receive the following error while invoking the web service class (the error description would be similar to one of the following errors)
有时，在调用Web服务类时（错误描述与以下的错误很相似），您可能会接受以下的错误
A similar but more subtle problem emerges when user-defined class loaders are employed: the class we actually call may not be the one we expected to call.
类似的，当开发者使用自己的类加载器的时候，一个更微妙的问题就发生了：我们实际调用的那个类可能不是我们期望的那个类。
As to two or more similar designs for the same product or for products which fall into the same class and are sold or used in sets, an application for one design may be filed.
同一产品两项以上的相似外观设计，或者用于同一类别并且成套出售或者使用的产品的两项以上外观设计，可以作为一件申请提出。
With the cluster analysis on test results, we can gather the similar learners who have the same answer as one class.
以学习者的试题答题数据为依据对学习者进行聚类分析，使得答题情况相近的学习者聚为一类。
A child from a privileged background is four times as likely to reach a Gymnasium, the main route to university, as one with similar grades from a working-class family.
有优越背景的孩子比其他差不多成绩，但是来自工薪阶层的孩子多四倍的机会进入高等中学。而这，是上大学的最主要途径。
In a similar vein, who would like to be the one that tells a class of kindergarteners that their just-completed finger paintings are not works of art because no one understands them?
同样，谁能告诉幼儿园的孩童们，他们刚刚完成的手指画不是艺术品，因为没有人理解它们？
In a similar vein, who would like to be the one that tells a class of kindergarteners that their just-completed finger paintings are not works of art because no one understands them?
同样，谁能告诉幼儿园的孩童们，他们刚刚完成的手指画不是艺术品，因为没有人理解它们？
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