The KeyedFile class represents a system file that has access by key while the SequentialFile class represents a system file that has access by record number.
Keyed file类表示一个通过密钥访问的系统文件，而sequentialfile类表示一个通过记录编号访问的系统文件。
The KeyedFile class represents a system file that has access by key while the SequentialFile class represents a system file that has access by record number.
Keyed file类表示一个通过密钥访问的系统文件，而sequentialfile类表示一个通过记录编号访问的系统文件。
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