double standard

详细解释:【化】 双重标准
【经】 双本位制

英语解释：

名词 double standard:

an ethical or moral code that applies more strictly to one group than to another

例句：

He's got a double standard: it's all right for him to have affairs but not for her.他采取双重标准: 自己可以有外遇，女方却不行。