楼主可能想问他的同义句吧What is your brother?==what does your brother do?==What's your brother's job?都翻译成，你的哥哥是做什么的？对工作进行提问祝你你学习进步
这句话的意思等同于问你：what does your brother do? 你哥哥（弟弟）是从事什么行业？
此话问的是：你哥是什么职业
