... String(const char *str = NULL);//通用构造函数 String(const String &another);//复制构造函数 ~String();//析构函数 ...
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在大约200,000个通用构造函数调用的实例上，两种算法大约90%的时候都可以预测到结果。
On approximately 200,000 instances of generic constructor invocations, both algorithms predicted the correct result approximately 90 percent of the time.
这就意味着XQuery是由多种表达式构成的，如路径表达式、条件表达式以及元素构造函数，是完全通用的。
This means that XQuery consists of several kinds of expressions, such as path expressions, conditional expressions, and element constructors, that can be composed with full generality.
阐释如何使用继承将一组通用属性和方法添加到用给定构造函数创建的对象。
Illustrates how to use inheritance to add a common set of properties and methods to objects created with a given constructor function.
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