双引号会让程序被检查是不是有变量
用到变量的时候用双引号才可以被编译，才可以替代成变量的值
还有n等要也是要双引号的,用单引号就直接输出n了
而单引号将直接把程序给显示出来
单引号的特点，省时间，编译器不会把其当作变量去翻译哦
建议没变数的用单引号
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