translation.en: It's sold at umbrella stands all over the streets, where people are unregistered, unlicensed, but MTN makes most of its profits, perhaps 90 percent of its profits, from selling through System D, the informal economy.
translation.zh: 他们就在街上那些伞搁架上卖， 尽管人们都是没有登记，没有执照的 但MTN确实赚了一笔， 约占他们总盈利的90%吧， 就仅从这个D系统，这个非正式经济中得到盈利。