Because the concept of "lines" isn't relevant for binary files (logical data constructs are not generally terminated by newlines), you must always specify the number of bytes that you wish to read in.
由于“行”的概念与二进制文件无关(逻辑数据结构通常都不是由新行终止)，因此您必须指定需要读入的字节数。
Printers recognize the form-feed character and automatically advance the print head by the required number of lines necessary to begin the next line of data on a new page.
打印机会识别换页符并自动根据在新的页开始新行所需的行数移动打印头。
Input files contain a regexp to test on a single line followed by any number of lines of data to test.
输入文件中包含用于测试单行(其后跟着多行待测试数据)的regexp。
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