In the case of a graphic strings, two bytes constitute a character and you use the number of double bytes to represent the length of the string.

对于图形字符串，两个字节组成一个字符，使用双字节数来表示字符串的长度。

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The first time around, the templated version of f is called, with a string as the first argument type, and the character and double are packed off as the variable size argument.

首先调用 f 的模板化版本，第一个参数的类型是字符串，作为大小可变的参数提供字符和双精度值。

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Interpreted string literals are character sequences between double quotes .

解释字符串字面值就是双引号之间的字符序列。

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