The service is --  fully self-sustainable from its own revenues, without accessing any public funds, and the cross-subsidy model actually works, where the rich pays higher, poor pays lower, and the accident victim is getting the service free of charge.
此服务是—  自给自足的， 不需要任何公共资金的援助 而且这中交叉补贴模式的确有效， 富人支付更多的钱而穷人则少付， 事故的受害者们则完全免费。