求翻译：二是挂名不上岗。有些企业招收下岗失业人员，因为岗位安排或嫌下岗失业人员年龄偏大等原因，“用证不用人”只给一点补贴，将减免税优惠占为企业所有。三是卖发票回利。有的下岗失业人员从事个体经营享受税收优惠后，向税务部门多领发票，因为不建帐，现金交易，就为他人代开发票，甚至将发票出借或卖给其他经营者非法牟利。是什么意思？

II is the titular does not post. Some firms to recruit unemployed, because the status arrangements or too large unemployed age and other factors, the "syndrome of not employing" just for subsidies, tax concessions to enterprises of all. Three is selling invoice back to profit. After the unemployed self-employed tax discount, invoice to the tax authorities, because the build account, cash transactions, on behalf of open invoices, even invoices loaned or sold to other operators of illegal profit.