不管是哪种情况，都可以将CA的一行作为二进制数相加。
In either case, you can code up a row of the ca as a binary number.
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。
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.
“行到二进制数”的映射。
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