这种类型的错误是这样产生的：定义的某些基本例没有被给出它们自己的类，然后以这种方法定义了一个递归的数据类型。
Bugs of this sort result from defining a recursive datatype in such a way that certain base cases of the definition are not given their own classes.
原因：定义的某些基本例没有给出自己的类，然后以这种方法定义了递归数据类型。
Cause: The recursive datatype is defined in such a way that certain base cases of the definition are not given their own classes.
相反的每一个收集和出版制造工业统计数据的官方机构都会对如何届定哪一类操作为化学工业有自己的定义。
Instead each official body which collects and publishes statistics on manufacturing industry will have its definition as to which operations are classified as the chemical industry.
从下述抽象中选择一个(或一个自己定义的抽象)，确定类中需要什么数据，并提供适当的构造函数集。解释你的决定。
Choose one of the following abstractions (or an abstraction of your own choosing). Determine what data is needed in the class. Provide an appropriate set of constructors. Explain your decisions.
然后，每一个继承出来的类都可以定义自己的汇报和租金，控制数据结构和方法。
Then, each would define its own transactions or rentals handling data structures and methods.
然后，每一个继承出来的类都可以定义自己的汇报和租金，控制数据结构和方法。
Then, each would define its own transactions or rentals handling data structures and methods.
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