That is, the token is to be replaced with a value associated with the name of the variable; or, if no value as been defined, with either the default value or an empty string.

也就是说，该标记将会被与变量名关联的值替换；如果没有定义关联值，那么就会替换为默认值或空字符串。

youdao

That is, the token is to be replaced with a value associated with the name of the variable; or, if no value as been defined, with either the default value or an empty string.

也就是说，该标记将会被与变量名关联的值替换；如果没有定义关联值，那么就会替换为默认值或空字符串。

youdao