It is needed when there should be a specific list of constant values to be used for the simple type defined by the enumeration.
当枚举定义的简单类型使用常数的特殊列表时，就会需要这种类型了。
Evaluate is called with the XPath string passed into the method, the DOM tree you built in the class's constructor, and the constant indicating to return results as a list of nodes.
使用传递给该方法的xpath字符串调用evaluate，在类的构造函数中构建的dom树和常量指示将结果作为一组节点返回。
ABC series were a constant feature of the BMJ from 1978-2006. Here we list those that are available in electronic form.
ABC系列是从1978- 2006的BMJ的一个经常的特征。这里，我们列出在电子形式是可得到的那些。
That one's not so obvious. So let's think about this for a second. To sort a list in linear time, would say, I have to look at each element in the list at most a constant number of times.
所以让我们来思考一会，要在线性时间能排序，列表里每个元素最多被使用常数次，不一定是一次，对吧。
That one's not so obvious. So let's think about this for a second. To sort a list in linear time, would say, I have to look at each element in the list at most a constant number of times.
所以让我们来思考一会，要在线性时间能排序，列表里每个元素最多被使用常数次，不一定是一次，对吧。
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