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.
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