在编写配置文件时，变量都以百分比符号(%)开始，表示未知的信息。
Variables begin with a percent symbol (%) and stand in for information that can't be known when the configuration file was written.
如果百分比符号之后的字元序列是无效的，则会将百分比符号置换成%25。
If the character sequence following a percent is not valid, the percent is replaced by % 25.
它包含了十进制分隔符，百分比字符等等之类的符号。
It contains symbols for decimal separator, percent character, and so forth.
它包含了十进制分隔符，百分比字符等等之类的符号。
It contains symbols for decimal separator, percent character, and so forth.
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