单独继承是指继承人为一人的继承。即使第二顺序的法定继承人有数人，但只要第一顺序继承人仅有一人，也应认为是单独继承。
单独定义类，以便从某框架继承类，而该框架受到单一的类属性限制。
Classes are defined solely to inherit from some framework, where that framework is narrowed by a single class attribute.
很多类似任务必须单独编写脚本，因为Ant缺乏对循环、继承和条件处理的支持；因而构建代码将出现重复，以致产生冗余代码。
Many similar tasks must be scripted separately because ant lacks support for loops, inheritance, and conditional processing; therefore, build code is duplicated and is sometimes redundant.
尽管继承映射是领域对象的一部分，出于它的重要性我们将它单独出来。
Although inheritance mapping is part of domain objects, we treat it separately due to its importance.
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