The call to map walks through each value, aliases it to v: val, evaluates the expression in the string, and replaces the value with the result of that expression.
调用map可以遍历各个值，将其作为别名赋给v：val，在字符串中计算表达式，并用表达式结果替换值。
The call to map walks through each value, aliases it to v: val, evaluates the expression in the string, and replaces the value with the result of that expression.
调用map可以遍历各个值，将其作为别名赋给v：val，在字符串中计算表达式，并用表达式结果替换值。
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