You must use quotes to set a variable to a lone slash, because an unquoted slash is interpreted as a division sign.

你必须使用引号去设置一个变量为一个长斜杠，因为一个不被引住的斜杠被解释为一个除号。

The division sign on the left mudguard is white.

左挡泥板上的帝国师临时师徽为白色.